Sennheiser ACCENTUM Wireless Headphones

Important Safety Information

Please read this user manual carefully and completely before using the device. Always pass on the user manual to third parties when handing over the product. Do not use the product if it is visibly damaged or if unusual sounds (hissing or beeping) are present. Use the product only in environments where wireless Bluetooth technology is available.

Protecting Hearing and Preventing Accidents

• Protect your hearing against high sound levels. Avoid listening at high volumes for extended periods. Sennheiser headphones deliver excellent sound quality at low and medium volume levels.
• The product generates strong magnetic fields that can interfere with pacemakers, implanted defibrillators (ICDs), and other implants. Maintain a distance of at least 10 cm (4 inches) between the product's magnetic components and any implant.
• Keep the product, packaging, and accessories away from children and pets to prevent accidents and choking hazards.
• Do not use the product in environments requiring special attention (e.g., in traffic), as the active noise cancellation may mask ambient sounds or alter warning signals.

Preventing Product Damage and Malfunctions

• Keep the product dry and avoid extreme temperatures (0°C to 40°C for normal operation). Avoid exposure to heat sources like hair dryers or direct sunlight, which can cause corrosion or deformation.
• Do not immerse the product in liquid.
• Do not cover the active noise cancellation microphones on the outside of the earcups to ensure proper functionality and noise cancellation.
• Only use accessories or replacement parts provided or recommended by Sonova Consumer Hearing.
• Clean the product only with a soft, dry cloth.

Lithium Battery Safety Information

⚠️ WARNING: In extreme conditions, standard/rechargeable batteries can leak. If misused or subjected to extreme conditions, the following hazards may occur: explosion, fire, heat, or gas/smoke.

• Only use batteries and chargers recommended by Sonova Consumer Hearing.
• Do not charge the product/batteries unattended.
• Charge the product/batteries only in ambient temperatures between 10°C and 40°C. Do not charge near flammable objects.
• Do not charge in humid environments. Ensure the charging port is dry and clean.
• Do not heat the product/batteries above 60°C. Avoid direct sunlight and do not dispose of batteries in fire.
• Switch off products powered by batteries after use.
• If the product is not used for an extended period, charge the batteries approximately every 3 months.
• Avoid prolonged skin contact with the product, battery, charger, or charging cable when connected to the mains. These components can heat up during charging and cause skin irritation.
• Dispose of defective products, including batteries, at designated collection points or electronics stores for recycling.

What's Included

• Around-Ear Headphones ACCENTUM (Model ACAEBT)
• USB C to USB A cable (approx. 1.2 m length)
• Quick Guide
• Safety Guide
• Compliance Sheet

You can find more information online:

• Detailed user manual and other information: www.sennheiser-hearing.com/download
• For setup and other functions of the headphones: Sennheiser Smart Control app (www.sennheiser-hearing.com/smartcontrol)
• List of accessories for ACCENTUM products: www.sennheiser-hearing.com/accentum
• For online shopping or to find a Sonova Consumer Hearing dealer in your country: www.sennheiser-hearing.com/service-support

Product Overview

The Sennheiser ACCENTUM headphones are designed for wireless audio communication, including music playback and phone calls, with Bluetooth-enabled devices.

Headphone Components

Diagram showing the Sennheiser ACCENTUM headphones with numbered parts:

• 1. Earpads: Provide comfort and seal around the ears.
• 2. Headband: Infinitely adjustable for a secure fit.
• 3. Earcups: House the speakers and controls.
• 4. Microphones (2 units): Used for phone calls.
• 5. LED Indicator: Shows the status of the headphones.
• 6. USB-C Port: For charging and USB audio connection (PC/Mac streaming).
• 7. Volume Up Button: Increases volume.
• 8. Music and Voice Call Button: Controls music playback and call functions.
• 9. Volume Down Button: Decreases volume.
• 10. Main Button (also acts as Power/Assistant button): Used for turning on/off, activating voice assistant, and pairing.
• 11. ANC Microphones: Located on the outside of the earcups for Active Noise Cancellation.
• 12. Internal Microphones: Located inside the earcups.

Button Functions

• Main Button (10): Press and hold for 3 seconds to turn on/off. Press and hold for 5 seconds to enter Bluetooth pairing mode. Can also be used for voice assistant activation.
• Volume Up/Down Buttons (7, 9): Adjust volume. Press and hold for larger volume steps.
• Music and Call Button (8): Single press for play/pause music or answer/end calls. Double press to skip to the next track. Triple press to go to the previous track.

LED Indicator Status

• Solid White (5s): Powering on.
• Flashing White (3x): Connected via Bluetooth.
• Alternating White/Red: Bluetooth pairing mode.
• Flashing Red (3x): Powering off.
• Solid Red (flashing): Battery charge 0-20%.
• Solid Yellow (flashing): Battery charge 20-90%.
• Solid Green (flashing): Battery charge 90-100%.
• Solid Green (5 min): Battery fully charged (100%) and then turns off.

Call Handling

• Answering a Call: Press the Music and Call Button (8) once.
• Ending a Call: Press the Music and Call Button (8) once.
• Rejecting a Call: Press and hold the Music and Call Button (8) for 2 seconds.
• Putting a Call on Hold / Switching Calls: Press the Music and Call Button (8) twice to put the active call on hold and switch to a new incoming call. Press twice again to switch back.
• Muting/Unmuting Microphone: During a call, press the Main Button (10) once. You will hear a "Mute on" or "Mute off" audio prompt.

Getting Started

1. Charging the Battery

The battery is not fully charged upon delivery. Charge the battery fully before first use without interruption (approx. 3 hours). The LED indicator will show the charging status. A full charge (100%) is indicated by the LED turning solid green for 5 minutes before turning off. If the battery level drops critically low, an audio prompt will request you to recharge the headset.

Diagram: Shows headphones connected via USB-C to a power source (USB A adapter not included). LED indicators show charging status (red, yellow, green).

2. Connecting via Bluetooth

To use wireless Bluetooth, pair your headphones with your smartphone or other Bluetooth-enabled device. Turn on the headphones by pressing the Main Button (10) for 3 seconds. For initial pairing, the headphones automatically enter pairing mode (LED alternates white and red). Activate Bluetooth on your device, search for available devices, and select "ACCENTUM". If prompted, enter PIN "0000". A successful pairing is confirmed by audio prompts and the LED flashing white three times.

Diagram: Shows headphones with Bluetooth symbol, phone with Bluetooth symbol, and connection status icons.

3. Using the Smart Control App

Download and install the Sennheiser Smart Control app from your device's app store (App Store or Google Play). The app allows you to manage all headphone functions, customize settings, and access features like equalizer and firmware updates. Connect your headphones via Bluetooth and launch the app.

Diagram: Shows app store logos and QR code for downloading the Sennheiser Smart Control app.

4. Wearing and Adjusting the Headphones

To ensure optimal sound quality and comfortable wear, adjust the headband so the earcups fit snugly and evenly around your ears. The headband is adjustable to fit different head sizes. Ensure the earcups fully cover your ears for the best acoustic seal.

Diagram: Shows how to place the headphones on the head and adjust the headband sliders.

Using the Headphones

Battery and Charging

The headphones feature an internal rechargeable battery. A full charge takes approximately 3 hours. Charging time may vary depending on the power source and ambient temperature. It is recommended to charge the battery fully before the first use. The LED indicator displays the charging status:

• Red flashing: Battery charge 0-20%.
• Yellow flashing: Battery charge 20-90%.
• Green flashing: Battery charge 90-100%.
• Solid Green (5 min): Battery fully charged (100%), then turns off.

If the LED indicator is off, ensure the charging port is clean. Continue charging for at least 30 minutes. If the battery is completely empty, it may take a few minutes for the LED indicator to show charging status.

You can listen to music or make calls while charging, though charging time may increase.

Bluetooth Connection

The headphones are compatible with Bluetooth 5.2. They automatically connect to the last two used Bluetooth devices when turned on. The headphones can store connection profiles for up to six paired Bluetooth devices. Audio playback is only possible from one device at a time. If you pair a seventh device, the oldest paired device's profile will be overwritten.

Pairing with a Bluetooth Device

1. Bring the turned-off headphones close to your Bluetooth device (max. 20 cm).
2. Press and hold the Main Button (10) for 3 seconds to turn on the headphones. A prompt will sound, and the LED will light up white for 5 seconds.
3. Press and hold the Main Button (10) for another 5 seconds to enter pairing mode. The LED will alternate white and red.
4. Activate Bluetooth on your device.
5. Enable searching for Bluetooth devices in your device's Bluetooth menu. All active Bluetooth devices in the vicinity will be displayed.
6. Select "ACCENTUM" from the list of found Bluetooth devices. If prompted, enter the PIN "0000".
7. Upon successful pairing, you will hear "Pairing successful" and "Connected" audio prompts. The LED will flash white three times.

If a connection is not established within 2 minutes, pairing mode will end, and the headphones will enter standby mode. Repeat the steps if necessary.

Changing Bluetooth Connection / "Connections"

To switch the audio connection to a paired Bluetooth device, use the "Connections" function in the Smart Control app. Select the desired paired device from the list. Ensure the device is powered on and Bluetooth is enabled. The audio connection will be established.

Disconnecting from a Bluetooth Device

To disconnect the headphones from a Bluetooth device, go to your device's Bluetooth menu and select the option to disconnect or unpair. You will hear the "No connection" audio prompt, and the headphones will enter standby mode.

Music Playback

You can listen to music when the headphones are connected via Bluetooth or USB. Use the Music and Call Button (8) to control playback:

• Single Press: Play or pause music.
• Double Press: Skip to the next track.
• Triple Press: Go to the previous track.

If music playback does not start, ensure the Smart Control app's "Automatic pause" function is not enabled or disable it. Also, ensure the music playback app on your Bluetooth device is running.

Call Handling

These call functions are available when the headphones are connected via Bluetooth to a smartphone or PC/Mac. Active Noise Cancellation is always active during calls for optimal voice clarity. Transparency mode is not available during calls.

• Answering/Ending Calls: Single press the Music and Call Button (8).
• Rejecting Calls: Press and hold the Music and Call Button (8) for 2 seconds.
• Call Waiting/Switching: Double press the Music and Call Button (8) to put the active call on hold and switch to a new incoming call, or to switch between active and held calls.
• Microphone Mute: During a call, press the Main Button (10) once. You will hear "Mute on". Press again to unmute ("Mute off").

Diagram: Shows call control button presses for answering, rejecting, and muting.

Voice Assistant

To activate your device's voice assistant (e.g., Siri, Google Assistant), press the Main Button (10) once. The available voice assistant on your mobile device will be activated. You can then speak your command. To cancel the voice assistant, press the Main Button (10) once.

Diagram: Shows pressing the main button to activate the voice assistant.

Sidetone

The Sidetone function allows you to hear your own voice during phone calls, making conversations more natural. This function can be enabled, adjusted, or disabled via the Smart Control app.

Active Noise Cancellation (ANC) and Transparency Mode

The ACCENTUM headphones offer Active Noise Cancellation (ANC) to reduce ambient noise and Transparency mode to allow you to hear your surroundings without removing the headphones. You can switch between ANC and Transparency mode by double-pressing the Main Button (10).

Adjusting Sound Effects and EQ

Use the Sennheiser Smart Control app to customize sound effects and adjust the equalizer. You can choose preset sound profiles, adjust bass, or create your own settings. These settings are saved on the headphones and are active regardless of the connected device.

Sound Notifications

You can adjust or disable sound notifications and voice prompts through the Smart Control app settings.

Bluetooth Off / Airplane Mode

To disable the wireless Bluetooth connection, for example, during flights, press the Main Button (10) five times. You will hear the "No connection" audio prompt. To re-enable Bluetooth, press the Main Button (10) five times again. You will hear the "Connected" audio prompt.

Diagram: Shows pressing the main button 5 times to turn Bluetooth off/on.

USB Connection

You can connect the headphones to a Mac/PC or mobile device using the included USB cable. This allows for audio playback directly from the device and also charges the headphones. Ensure "ACCENTUM" is set as the default audio playback and recording device in your system settings.

Care and Maintenance

• Cleaning: Clean the product parts only with a soft, dry cloth. Do not use solvents or detergents. Clean the charging port by blowing into it or gently using a soft brush or interdental brush for stubborn dirt.
• Replacing Ear Pads: For hygiene, it is recommended to replace the ear pads periodically. Replacement ear pads can be purchased from the Sennheiser website or authorized dealers. To replace, gently pull off the old ear pad and press the new one into place, aligning it with the notch on the earcup.

Diagram: Shows how to remove and attach ear pads.

Battery Information and Firmware Updates

The internal battery is designed for long life. For the latest features and optimal performance, it is recommended to keep the headphone firmware updated. Updates can be installed via the Sennheiser Smart Control app.

Troubleshooting

If you encounter issues with your headphones, try the following steps:

• Reset: Press and hold the Main Button (10) for 15 seconds. This will reset the headphones without deleting pairing settings.
• Update Firmware: Ensure you have the latest firmware installed via the Smart Control app.
• Factory Reset: If problems persist, you can perform a factory reset via the Smart Control app. This will erase all custom settings and pairing information.
• Check FAQ: Refer to the FAQ section on the Sennheiser website for common questions and solutions.
• Contact Support: If the issue is not resolved, contact Sonova Consumer Hearing for assistance.

Bluetooth Range: The Bluetooth range is typically up to 10 meters (33 feet) in open space. Walls and other environmental factors can affect the range. If you move out of range, you may hear a "Lost connection" prompt, and the connection will automatically re-establish when you return to range.

Technical Specifications

Manufacturer Declarations

Warranty

Sonova Consumer Hearing GmbH provides a 12-month warranty for this product. Current warranty conditions can be found on the internet at www.sennheiser-hearing.com/warranty or from your Sonova Consumer Hearing dealer.

Spare Parts and Repair Services

Sonova Consumer Hearing GmbH does not guarantee the availability of spare parts, repair services, or information beyond the limited warranty period. For product maintenance or repair, please contact an authorized dealer.

Compliance

This product complies with relevant EU and UK regulations, including the General Product Safety Regulation, Battery Regulation, and RoHS Directive. The full text of the EU Declaration of Conformity is available at www.sennheiser-hearing.com/download.

Disposal Information

Electrical and electronic equipment, batteries, and packaging should be disposed of separately at the end of their service life. This helps to promote recycling and prevent negative environmental or health impacts. Contact your local authorities or recycling centers for proper disposal procedures.

Trademarks

Apple, the Apple logo, Siri, App Store, Android, Google Play, and Bluetooth® are trademarks of their respective owners. Qualcomm aptX™ is a product of Qualcomm Technologies International, Ltd.