Audio-Technica ATH-CKS50TW Wireless Earbuds

Safety Warnings

Although this product is designed for safe use, incorrect usage can lead to accidents. To ensure safety, observe all warnings and precautions while using the product.

Precautions for the Earbuds

• Do not use the product near medical equipment. Radio waves can affect pacemakers and electronic medical equipment. Do not use in medical facilities.
• When using the product on an aircraft, follow airline instructions.
• Do not use the product near automatic control devices such as automatic doors and fire alarms. Radio waves can affect electronic equipment and cause accidents due to malfunctions.
• Do not disassemble, modify, or attempt to repair the product to avoid electric shock, malfunction, or fire.
• Do not subject the product to strong impacts to avoid electric shock, malfunction, or fire.
• Do not handle the product with wet hands to avoid electric shock or damage.
• Disconnect the product from a device if it starts malfunctioning, emits smoke, odor, heat, abnormal noises, or shows any other symptom of failure. In such cases, contact your local Audio-Technica dealer.
• Do not allow the product to get wet to avoid electric shock or malfunction.
• Do not insert foreign substances such as combustible materials, metal objects, or liquids into the product.
• Do not cover the product with a cloth to prevent fire or injury from overheating.
• Follow applicable laws regarding mobile phone and earphone use while driving.
• Do not use the product in environments where the inability to hear ambient sound poses a serious risk (e.g., railway crossings, train stations, construction sites).
• The product effectively blocks external sound, so while wearing it, you may not clearly hear surrounding sounds. Adjust the volume to a level that allows you to hear background sound and monitor your surroundings while listening to music.
• Keep the product out of reach of small children.
• Do not listen at excessively high volumes to prevent damage to your hearing. Listening at too high a volume for prolonged periods may cause temporary or permanent hearing loss.
• Discontinue use if skin irritation occurs due to direct contact.
• If you feel unwell while using the product, stop using it immediately.
• When removing earbuds from your ears, ensure the eartips are attached to the main unit. If eartips remain lodged in your ears and cannot be removed, seek immediate medical attention.
• If you experience itching while using the product, discontinue use.

Precautions for the Charging Case

• Do not disassemble, modify, or attempt to repair the product to avoid electric shock, malfunction, or fire.
• Do not subject the product to strong impacts to avoid electric shock, malfunction, or fire.

Rechargeable Battery Precautions

The earbuds and charging case are equipped with a rechargeable battery (lithium-ion battery).

• If battery fluid contacts your eyes, do not rub them. Rinse thoroughly with clean water, such as tap water, and seek immediate medical attention.
• If battery fluid leaks, do not touch the fluid with bare hands. If the fluid remains inside the product, it may cause malfunction. If battery fluid leaks, contact your local Audio-Technica dealer.
• If fluid contacts your mouth, rinse thoroughly with clean water, such as tap water, and seek immediate medical attention.
• If fluid contacts your skin or clothing, immediately wash the affected skin or clothing with water. If skin irritation occurs, seek medical attention.
• To prevent leaks, heat generation, or explosions:
• Never heat, disassemble, modify, or throw the battery into fire.
• Do not attempt to puncture the battery with a nail, strike it with a hammer, or step on it.
• Do not drop the product or subject it to strong impacts.
• Do not get the battery wet.
• Do not use, place, or store the battery in the following locations:
• Areas exposed to direct sunlight or high temperatures and humidity.
• Inside a car in hot weather.
• Near heat sources such as heaters.

Only charge with the included USB cable to prevent malfunction or fire.

The user cannot replace the internal rechargeable battery. If the usage time becomes significantly shorter even after fully charging, the battery may have reached the end of its life. In this case, the battery needs to be repaired. Consult your local Audio-Technica dealer for repair details.

When disposing of the product, the built-in rechargeable battery must be disposed of properly. Contact your local Audio-Technica dealer for correct disposal instructions.

For Customers in the U.S.A.

FCC Notice

Warning: This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Caution: Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

This transmitter must not be co-located or operated in conjunction with any other antenna or transmitter.

Radio Frequency Exposure Statement

This device complies with FCC radiation exposure limits set forth for an uncontrolled environment and meets the FCC Radio Frequency (RF) Exposure guidelines. This equipment generates very low levels of RF energy that are considered compliant without Specific Absorption Rate (SAR) testing.

Contact:

Responsible Company: Audio-Technica U.S., Inc.
Address: 1221 Commerce Drive, Stow, Ohio 44224, U.S.A.
Tel: 330-686-2600

For Customers in Canada

ISED Conformity Statement

CAN ICES-3 (B)/NMB-3(B)

This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada’s licence-exempt RSS(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

This device complies with RSS-102 radiation exposure limits set forth for an uncontrolled environment.

Usage Notes

• Read the user manual of the connected device before use.
• Audio-Technica is not liable for data loss in the unlikely event that such loss occurs during product use.
• In public transport and other public places, keep the volume low so as not to disturb others.
• Minimize the device volume before connecting the product.
• When using the product in a dry environment, you may experience a tingling sensation in your ears. This sensation is caused by static electricity accumulated on your body, not by product malfunction.
• Do not subject the product to strong impacts.
• Do not store the product in direct sunlight, near heating devices, or in hot, humid, or dusty locations. Also, do not get the product wet.
• When the product is used for extended periods, it may discolor due to ultraviolet light (especially direct sunlight) and wear.
• If the charging case is placed in a bag with the USB charging cable still connected, the USB cable may become trapped, cut, or broken.
• Always hold the connector when connecting and disconnecting the USB charging cable. The USB charging cable could be cut, or an accident could occur if the cable itself is pulled.
• When the USB charging cable is not in use, disconnect it from the charging case.
• When the product is not in use, store it in the included charging case.
• If you use eartips other than the included ones, the earbuds may not fit in the charging case or may not charge. Be sure to use the included eartips.
• When using the product, select eartips that best fit your ears and securely insert the product.
• This product can be used for phone calls only when using a mobile phone network. Compatibility with telephony applications using a mobile data network is not guaranteed.
• If you use the product near an electronic device or transmitter (such as a mobile phone), abnormal noises may be heard. In this case, move the product away from the electronic device or transmitter.
• If you use the product near a radio or television antenna, noise may be generated in the TV or radio signal. In this case, move the product away from the radio or television antenna.
• To protect the rechargeable battery, charge it at least once every six months. If too much time passes between charges, the rechargeable battery's lifespan may be reduced, or it may no longer be able to charge.
• Charge the product in a well-ventilated area (10 to 35 °C), away from direct sunlight. Otherwise, the battery may deteriorate, leading to shorter continuous use periods or failure to charge.
• If the earbuds are wet, wipe them with a dry cloth before placing them in the charging case. The charging case is not drip-proof. Do not charge the product if the earbuds are wet.
• The product's ambient sound function allows you to hear surrounding sounds through the built-in microphone. Depending on the music playback volume, it may be difficult to hear ambient sounds. In such cases, lower the music volume.
• Depending on the environment, ambient sounds may still be difficult to hear even when using the product's ambient sound mode. Do not use the product in locations where it is dangerous not to hear ambient sounds, such as in heavy traffic areas.

About the Active Noise Cancellation Function

The product is designed to use its built-in microphone to capture ambient noise (vehicle noise, air conditioner noise, etc.) and cancel that noise by producing sounds in the negative phase. This results in a reduction of your surrounding sound.

• The product's noise cancellation function is most effective against low-frequency range noise, but not all noises are canceled.
• Depending on the type of noise (or in quiet locations), you may not notice the noise cancellation effect.
• Depending on how the product is worn, the noise cancellation effect may vary, or a whistling sound (siren) may occur. In such cases, remove the product and put it back on correctly.
• To maximize the noise cancellation effect, select eartips that offer the best acoustic isolation for each side to block surrounding sound, and insert the earbuds into your ears correctly.
• When the product is used in a train or vehicle, such as a bus or truck, noise may be heard depending on the condition of the tracks or road.

About the Water Resistance (Drip-proof) Level

The water resistance (drip-proof) specification of this product applies only to the earbuds, not the charging case.

• Although the earbuds have water resistance (drip-proof) capabilities equivalent to IPX4 protection, the sound output area is not water-resistant (drip-proof).
• The water resistance (drip-proof) level is designed to protect the earbuds if they get wet from rain, etc. (equivalent to IPX4 protection). The JIS/IEC IPX4 protection rating means the product is protected against water exposure from all directions.
• The earbuds cannot be used underwater.
• The earbuds cannot be used in hot and humid locations, such as bathrooms.
• The earbuds are not waterproof. Submerging them may cause damage.
• The earbuds may not function correctly if they get wet. Wipe the earbuds with a dry cloth, shake them several times to remove excess water, and let the earbuds dry thoroughly before use.

For More Enjoyable Bluetooth Communication

The effective communication range of this product varies depending on obstacles and radio wave conditions. For a more enjoyable experience, use the product as close as possible to the Bluetooth device. To minimize noise and sound interruptions, try not to place your body or any other obstacle between the product's antenna and the Bluetooth device.

Diagram Description: An illustration shows the location of the product's antenna relative to the user's body and a Bluetooth device.

Parts and Functions

Earbuds

Diagram Description: A close-up view of an earbud with numbered callouts pointing to its components: 1. L/R Indicator, 2. Multifunction Button, 3. Indicator Light, 4. Microphone.

• 1. L/R Indicator: Left/Right indicator.
• 2. Multifunction Button: Used for playing/pausing music and answering phone calls. Also used for adjusting volume (+/-). The left side (L) has a tactile bump to distinguish it from the right side.
• 3. Indicator Light: Shows the operating status and battery level of the earbuds.
• 4. Microphone: For calls and voice commands.

Charging Case

Diagram Description: A view of the charging case with numbered callouts: 1. Cover, 2. Charging Indicator Lights, 3. Battery Terminal.

• 1. Cover: The lid of the charging case.
• 2. Charging Indicator Lights: Illuminate/flash when the charging case is being charged. They also show the battery level of the charging case.
• 3. Battery Terminal: Used to connect the included USB charging cable to charge the product.

Accessories

Diagram Description: Illustrations of the included accessories: 1. USB Charging Cable, 2. Eartips.

• 1. USB Charging Cable: 30 cm, USB Type-A/USB Type-C™.
• 2. Eartips: Available in sizes XS, S, M, L. Size M eartips are attached to the product at the time of purchase.

Removing Sealing Eartips

Diagram Description: An illustration showing how to remove the sealing eartips from the earbuds.

Remove the sealing eartips before use.

Charging the Battery

Charge the battery fully before using the product for the first time.

When the rechargeable battery is running low, voice guidance will announce "Low battery," and the indicator light will flash red. Charge the battery as soon as possible.

The earbuds take approximately 3 hours to fully charge, and the charging case takes approximately 3 hours. (Charging times may vary depending on usage conditions.)

Charge the product in a well-ventilated area (10 to 35 °C), away from direct sunlight. Charging outside the normal charging temperature range may cause charging failure or longer charging times. Otherwise, the battery may deteriorate, leading to shorter continuous use periods or failure to charge.

Charging the Earbuds and Charging Case

1. Connect the included USB charging cable (USB Type-C end) to the battery terminal.

The included USB charging cable is designed for exclusive use with this product. Do not use any other USB charging cable.

When inserting the USB charging cable into the USB port or battery terminal, insert it straight (horizontally).

Diagram Description: Illustration showing a USB Type-C cable connecting to the charging case and a USB Type-A cable connecting to a power source (e.g., computer).

2. Place the earbuds in the charging case.

When charging the earbuds, ensure the earbud indicator lights illuminate. If they do not illuminate, remove the earbuds and place them back in the case.

Charging via Computer

1. Connect the included USB charging cable (USB Type-A end) to your computer to start charging.

During charging, the four charging indicator lights will illuminate/flash as follows. (The charging indicator lights may take several seconds to illuminate.)

[1] The charging case or earbuds may be warm. Allow the product temperature to cool sufficiently before charging in a well-ventilated area (10 to 35 °C), away from direct sunlight.

4. Once charging is complete, disconnect the USB charging cable (USB Type-A end) from your computer.
5. Disconnect the USB charging cable (USB Type-C end) from the product's battery terminal.

To charge the product, be sure to use the included USB charging cable. The product may not charge if you use cables other than the included USB charging cable.

Always ensure the earbuds are not wet before charging. The earbuds may not function correctly or turn on if they are wet. Wipe the earbuds with a dry cloth, shake them several times to remove excess water, and let them dry thoroughly before charging.

Charging Earbuds Without USB Cable

The charging case has a built-in rechargeable battery. If you have charged the charging case, you can charge the earbuds without needing the USB charging cable.

Checking Charging Case Battery Level

1. Open/close the charging case cover.

The indicator lights illuminate as follows. The number of illuminated charging indicator lights indicates the battery level.

If the bottom charging indicator light flashes twice in succession, the charging case is fully discharged. Charge the charging case.

Powering On/Off

Turning the Product On

1. Remove the earbuds from the charging case.

The power will turn on automatically, and the indicator lights will illuminate white and then flash. Voice guidance will play.

• To manually turn on the product, press and hold the multifunction buttons (approx. 4 seconds).
• The indicator light may take several seconds to illuminate.
• Refer to "Voice Control" (p. 29) for more information on voice control.

Turning the Product Off

1. Place the earbuds in the charging case.

The power will turn off automatically.

• To manually turn off the power, press and hold the multifunction buttons (for about 4 seconds). While holding the multifunction buttons, you will hear a confirmation sound once after approximately one second, but keep holding them until the power turns off.

Bluetooth Connection

To connect the product to a Bluetooth device, the product must first be paired (registered) with the device.

Pairing a Bluetooth Device

• Read the user manual of the Bluetooth device.
• Place the Bluetooth device within 1 meter of the product for correct pairing.
• Use the product to listen for voice prompts during pairing.

1. Remove the L (left) and R (right) earbuds from the charging case.

The indicator light will illuminate white and then flash.

2. Use the Bluetooth device to start the pairing process and search for the product. When the Bluetooth device finds the product, "ATH-CKS50TW" will appear on the device.

For more information about using your Bluetooth device, refer to the device's user manual.

3. Select "ATH-CKS50TW" to pair the product with the Bluetooth device.

Some devices may request an access code. If so, enter "0000". The access code may also be called a passcode, PIN code, PIN number, or password.

Fast Pair Pairing

With a single touch, the product enables quick Bluetooth pairing with your Android devices. You can even check where you last left them.

1. Activate the Bluetooth function on an Android device configured with a Google account.
2. Remove the earbuds (L (left) and R (right)) from the charging case and bring them close to the Android device.

Diagram Description: Illustration of a smartphone screen showing Bluetooth connection status and a pairing notification.

3. Tap the pairing notification that appears on your Android device.

Voice guidance will announce "Bluetooth connected" when pairing is complete.

About Pairing

When connecting to a new Bluetooth device, it must be paired with the product. Once the Bluetooth device and the product are paired, you will not need to pair them again. The product supports multiple pairings, storing a connection history. However, even if the Bluetooth device has been paired once, you will need to re-pair it in the following cases:

• If the product is deleted from the Bluetooth device's connection history.
• If the product is sent for repair.
• If the product is reset.

Multipoint Function

The product supports multipoint technology, allowing connection to two Bluetooth devices simultaneously. While listening to music from one device, you can answer a call from another device. This is convenient if you use two smartphones, for example.

Audio-Technica does not guarantee operation with all Bluetooth device combinations.

Connecting with Multipoint Technology

1. Pair the first Bluetooth device.
2. After pairing the first device, turn off the Bluetooth function.
3. Pair the second Bluetooth device.
4. Activate the configuration of the first Bluetooth device.

• If the product does not connect, turn it off and then on again.
• With multipoint technology, it is possible to connect up to two Bluetooth devices simultaneously. To connect a third Bluetooth device, disconnect one of the connected devices.

Using the Product

Insert the product end marked "L" (left) into your left ear, and the end marked "R" (right) into your right ear.

Listening to Music

• For the first connection, pair the product with your device using Bluetooth wireless technology.
• If you have already paired the product with your Bluetooth device, activate the Bluetooth connection on the device before turning on the product.
• Use the Bluetooth device to start playback, referring to the device's user manual if necessary.

1. Remove the earbuds from the charging case and wear them.
2. Start playback on your Bluetooth device.
3. Press the multifunction button on the L (left) earbud once or twice consecutively to adjust the volume (up or down).
4. To pause music, press the multifunction button on the R (right) earbud.

Playback will start or pause with each press.

It is also possible to listen to music with a single earbud by taking out only one side from the charging case and wearing it in your ear. When using a single earbud, some functions will not be available depending on the side used. Use the Bluetooth device for operation in these cases.

Multifunction Button Operation (Right Earbud)

Diagram Description: Close-up of an earbud showing the multifunction button.

Controls described above may not be available on some smartphones.

Multifunction Button Operation (Left Earbud)

Diagram Description: Close-up of an earbud showing the multifunction button.

[1] A beep is heard each time the volume is increased/decreased by 1 level.
[2] Volume control on some Bluetooth devices may not work well with this product.

Controls described above may not be available on some smartphones.

Talking on the Phone

If your Bluetooth device supports phone functions, you can use the product to talk on the phone.

1. Remove the earbuds from the charging case and wear them.
2. Make/receive calls with your Bluetooth device.

When the Bluetooth device receives a phone call, the product emits a ringtone. If a call is received while listening to music, playback is interrupted.

3. To receive a call, press the multifunction button on the L (left) or R (right) earbud.

Calls can be answered from either the L (left) or R (right) earbud.

4. Press the multifunction button on the L (left) earbud once or twice consecutively to adjust the volume (up or down).

5. To end a call, press and hold the multifunction button on the L (left) or R (right) earbud (approx. 2 seconds).

Calls can be ended from either the L (left) or R (right) earbud.

If the call was received while listening to music, playback resumes. Music playback may not resume on some Bluetooth devices. In this case, music playback must be started manually.

It is also possible to make/receive calls with a single earbud by taking out only one side from the charging case and wearing it in your ear. When using a single earbud, some functions will not be available depending on the side used. Use the Bluetooth device for operation in these cases.

Multifunction Button Operation (Right Earbud)

Diagram Description: Close-up of an earbud showing the multifunction button.

Controls described above may not be available on some smartphones.

Multifunction Button Operation (Left Earbud)

Diagram Description: Close-up of an earbud showing the multifunction button.

Controls described above may not be available on some smartphones.

Quick Ambient Sound Function

This function enhances external sound to help you pay attention to human voices. The volume of the music being played decreases automatically. It is useful for hearing announcements on public transport or people's voices.

1. Press and hold the multifunction button on the R (right) earbud (approximately 1 second) and release when you hear a confirmation sound.

With each press, the Quick Ambient Sound function will be activated/deactivated (you can also deactivate it by pressing the multifunction button on the L (left) earbud).

The Quick Ambient Sound function cannot be used during a call.

• Depending on the environment, ambient sounds may be difficult to hear even when using the Quick Ambient Sound function. Do not use the product in locations where it is dangerous not to hear ambient sounds, such as in heavy traffic areas.
• When the Quick Ambient Sound function is active, do not cover the microphone with your hand. Doing so may emit a loud sound (siren) and could affect your hearing.

Ambient Control

The product includes an Ambient Control function to switch between Noise Cancellation and Ambient Sound modes. Functions can be changed from Off (default) to Ambient Sound or Noise Cancellation.

1. Press and hold the multifunction button on the L (left) earbud (approximately one second) and release when you hear a confirmation sound.

Functions can be switched from Off (default) to Ambient Sound or Noise Cancellation.

• Ambient control cannot be used during a call.
• Ambient sound may occasionally be difficult to hear depending on the music volume, etc., being played. In such cases, lower the music volume.
• Depending on the environment, ambient sounds may be difficult to hear even when using the product's ambient sound function. Do not use the product in locations where it is dangerous not to hear ambient sounds, such as in heavy traffic areas.
• When the Ambient Sound function is active, do not cover the microphone with your hand. Doing so may emit a loud sound (siren) and could affect your hearing.

Auto Power Off Function

The product automatically turns off after 5 minutes if it is not connected to a device.

Application for Smartphones

This product is compatible with our "CONNECT" application. The application allows you to conveniently access various functions. It also allows you to update the product's firmware. Visit: https://app.at-globalsupport.com

Audio-Technica CONNECT App (iOS, Android)

What You Can Do With the App

The application allows you to use the following functions. For more information, refer to the application screen.

360 Reality Audio

360 Reality Audio is an immersive new music experience that uses Sony's 360 Spatial Sound technology. Individual sounds, such as vocals, choirs, piano, guitar, bass, and even live audience sounds, can be placed in a 360° spherical sound field, offering artists and creators a new way to express their creativity. Listeners can immerse themselves in a sound field as conceived by the artists and creators. Requires a subscription to a compatible online music service; subscription fees may apply. Please visit https://www.sony.net/360RA to check service compatibility.

Indicator Light Display

Pairing

Connecting

Battery Level

Voice Control

The product provides voice prompts in English in the following situations.

Cleaning

Get into the habit of cleaning the product regularly to prolong its lifespan. Do not use alcohol, paint thinner, or other solvents for cleaning tasks.

• Remove dirt from the earbuds and charging case with a dry cloth. The earbuds may not function correctly or turn on if they are wet. Wipe the earbuds with a dry cloth, shake them several times to remove excess water, and let them dry thoroughly before use.
• Immediately wipe away sweat or any other moisture from the charging case's battery terminal, the earbuds' charging terminals, etc. Failure to do so may cause corrosion, leading to malfunction.
• Natural skin oils can accumulate in the eartip attachment areas (see diagram). If these areas are not cleaned, the eartips may come loose. Clean them regularly. Do not touch the sound output areas, as they are delicate. Doing so may cause malfunction.
• If moisture remains in the holes near the microphones (see figure), place the earbuds on a dry cloth and shake them several times to remove moisture, then let the earbuds dry thoroughly before use.
• Wipe any sweat or dirt from the USB charging cable with a dry cloth immediately after each use. If the cable is not wiped, it may deteriorate and harden over time, causing malfunction.
• If the USB terminal of the charging cable is dirty, wipe it with a dry cloth.
• To clean the eartips, remove them from the earbuds and clean them manually with a mild, diluted detergent. Once cleaning is complete, dry them before using them again.

Diagram Description: Close-up views of an earbud with callouts pointing to: 1. Eartip attachment area, 2. Sound output area, 3. Microphone. Also shows how to attach eartips.

If you do not intend to use the product for an extended period, store it in a well-ventilated place not exposed to high temperatures or humidity.

Eartips

Eartip Size

The product includes silicone eartips in 4 sizes (XS, S, M, and L). At the time of purchase, size M silicone eartips are attached to the product. To ensure maximum sound quality, select the eartip size that best suits you and insert the eartips into your ears so they fit snugly. If the eartips do not fit snugly, you will have difficulty hearing bass sounds.

Changing Eartips

Remove the old eartip and attach the new one by sliding it onto the earbud at an angle. Press firmly on the eartip so its interior expands, then snap it onto the post until it stops.

Eartips are consumables that degrade with use and storage. If eartips become loose and detach easily, or show signs of degradation, purchase replacements.

Periodically remove and clean eartips, as they get dirty easily. Using dirty eartips may cause the earbuds to become dirty, negatively affecting sound quality.

When reattaching previously removed eartips, check that they are securely attached. If eartips come loose and remain in the ear, injury or illness may occur.

Forced Pairing Mode / Reset

If the Product Does Not Connect to a Device (Forced Pairing Mode)

If pairing cannot be canceled or does not occur correctly, you can use forced pairing mode to re-pair.

• During operation, keep the earbuds in the charging case.
• About 5 seconds after both earbuds (L (left) and R (right) sides) are placed in the charging case (with remaining battery), press and hold the multifunction buttons on both earbuds for about 6 seconds.

You can use both earbuds simultaneously or one earbud at a time.

1. When the indicator lights on both earbuds turn red, remove the earbuds from the charging case.

The product will enter "Device search" state (pairing mode) and you can pair it with your desired Bluetooth device.

• If the procedure cannot be completed as expected, remove the earbuds from the charging case again and repeat the procedure from the beginning.

If the Product Operates Abnormally (Reset)

• Restart the product.
• During operation, keep the earbuds in the charging case.

1. About 5 seconds after both earbuds (L (left) and R (right) sides) are placed in the charging case (with remaining battery), press the multifunction buttons on both earbuds twice in succession.

You can use both earbuds simultaneously or one earbud at a time.

2. Check that the indicator lights on both earbuds flash white, then press and hold the multifunction buttons on both earbuds (for at least 6 seconds) while they are in the charging case.

• Ensure that the indicator lights on both earbuds illuminate red and then turn white before releasing your fingers.
• You can use both earbuds simultaneously or one earbud at a time.

The reset is complete.

3. Delete the product from the registered device list of your Bluetooth device.
4. Remove the earbuds from the charging case and perform pairing.

• If the procedure cannot be completed as expected, remove the earbuds from the charging case again and repeat the procedure from the beginning.

Troubleshooting

Not Turning On

• Charge the product.

Pairing Cannot Be Performed

• Check that the Bluetooth device communicates using version 2.1+EDR or higher.
• Place the product and the Bluetooth device about 1 meter apart.
• Configure the Bluetooth device's profiles. You can consult procedures on how to configure profiles in the Bluetooth device's user manual.
• Delete the Bluetooth device's pairing information and then re-pair the product with the device.
• Place the earbuds in the charging case, close the cover, then remove the earbuds and perform the operation again.
• Ensure you are not connected to any other previously connected Bluetooth device. If so, disconnect the product from the previously connected Bluetooth device, then select the product on the Bluetooth device you are connecting to. Use forced pairing mode if you cannot disconnect from a previously connected Bluetooth device. For more information, refer to "If the product does not connect to a device (forced pairing mode)" (p. 32).
• Restart the product if it cannot be unpaired, connected, or does not function as expected even after trying all other solutions. For more information, refer to "If the product operates abnormally (reset)" (p. 32).

No Sound / Sound is Weak

• Turn on the product and the Bluetooth device.
• Turn up the volume on the product and the Bluetooth device.
• Ensure the product and Bluetooth device are connected via A2DP (or a phone connection).
• Unpair the product and Bluetooth device, then re-pair the product with the device.
• Move away from obstacles between the product and Bluetooth device, such as people, metal, or walls, and bring the product and device closer together.
• Change the Bluetooth device's sound output to the product.
• Check if the Quick Ambient Sound function is activated/deactivated. If the Quick Ambient Sound function is activated, the volume of the music being played will decrease automatically. Pressing and holding (for one second) and releasing the multifunction button will activate/deactivate the Quick Ambient Sound function.

Sound Only From One Earbud

• Ensure there is battery remaining.
• Place the earbuds in the charging case, close the cover, then remove the earbuds and perform the operation again.

Sound is Distorted / Noise is Heard / Sound Cuts Out

• Lower the volume on the product and the Bluetooth device.
• Keep the product away from devices that emit radio waves, such as microwaves and wireless routers.
• Keep the product away from televisions, radios, and devices with built-in tuners. These devices may also be affected by the product.
• Disable the Bluetooth device's equalizer setting.
• Remove obstacles between the product and the Bluetooth device, and bring them closer together. For more information, refer to "For More Enjoyable Bluetooth Communication" (p. 8).
• Depending on how the product is worn, the noise cancellation effect may vary, or a whistling sound (siren) may occur. In such cases, remove the product and put it back on correctly.

Caller's Voice Cannot Be Heard / Caller's Voice is Very Low

• Turn on the product and the Bluetooth device.
• Turn up the volume on the product and the Bluetooth device.
• Check that the product and Bluetooth device are connected via HFP (or a phone connection).
• Unpair the product and Bluetooth device, then re-pair the product with the device.
• Change the Bluetooth device's sound output to the product.

Charging Case Cannot Be Charged

• Connect the included USB charging cable correctly and charge the product.
• The charging case or earbuds may be warm. Allow the product temperature to cool sufficiently before charging in a well-ventilated area (10 to 35 °C), away from direct sunlight.

Earbuds Cannot Be Charged

• Ensure the product is correctly placed in the charging case.
• Ensure the charging case lid is closed when charging.
• Charge the charging case.
• Remove dirt from the charging terminal with a dry cloth.
• The charging case or earbuds may be warm. Allow the product temperature to cool sufficiently before charging in a well-ventilated area (10 to 35 °C), away from direct sunlight.
• For more information on how to use your Bluetooth device, consult the device's user manual.

Specifications

Earphones

Microphone

Communication Specifications

Other

[1] When using Qualcomm® aptX™ Adaptive audio.
[2] The figures indicated above vary depending on operating conditions.
[3] Earbuds only.

The product is subject to change for product improvement without prior notice.

Trademarks

• The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc., and Audio-Technica Corporation uses these marks under license. Other trademarks and trade names are those of their respective owners.
• USB Type-C™ is a trademark of USB Implementers Forum.
• Google Play is a trademark of Google LLC.
• "SONY" is a registered trademark of Sony Group Corporation.
• Qualcomm aptX is a product of Qualcomm Technologies, Inc. and/or its subsidiaries. Qualcomm is a trademark of Qualcomm Incorporated, registered in the United States and other countries. aptX is a trademark of Qualcomm Technologies International, Ltd., registered in the United States and other countries.