Anker COOL4 Wireless Headset

What’s In The Box
- Headphones 1

- Type-C Charging Cable 1

- 3.5mm AUX Audio Cable 1

- User Manual 1

Specification
| Product Model | COOL4 |
| Product Name | Wireless Headset |
| Input | 5V ⎓ 1A |
| FCC ID | 2ASDY-COOL4 |
| Battery Capacity | 3.7V/500mAh, 1.85Wh |
| Charging Port | Type-C |
| Transmission Range | 15m/49ft (with no obstacle) |
| Speaker Size | Φ 40mm |
Product Overview
ANC Function
Volume +/Next Track
Volume-/Preious Track
Multi-function Button: Play/Pause/On/Off Button- Type-C Charging Port
- 3.5mm AUX Audio Jack
- LED Indicator Light
- Microphone
- Adjustable Headband
- Earmuff

First To Use
Please check the following components for integrity before first use.
- Check if the headphone has power: Press and hold the power button on the headphone to see if the LED indicator lights up. If there is no power, please charge the headset with the provided Type-C charging cable.
- Check whether the headband and the headphone frame are adjustable
- Check if the product has any missing parts.
If you encounter any of the above issues, please do not hesitate to contact us, and we will assist you in resolving them.
Wearing The Headphone
- Check the left and right units of the headphone.
- Extend the slider to its full length before putting on the headphone
- Put on the headphone with the ear pads fitting snugly over your ears
- Adjust the slider to a length where the headband touches the top of your head.
- Adjust the orientation of the left and right units so that the ear pads fit snugly all around your ears.
If you put on the headphone without adjusting the slider, the headphone may not be positioned properly on your head. resulting in discomfort or a weak noise canceling effect.

Power On
Hold Multi-function Button for 2 seconds until you hear “Power on” and the status light blinks blue for 1second.

Power Off
Hold Multi-function Button for 5 seconds until you hear “Power off” and the status light blinks blue for 1second.

NOTE:
- During a call, the headphones cannot be powered off manually.
- If the headphones are turned on but not paired with any device, they will automatically power down after approximately 3 minutes. However, the Active Noise Cancellation (ANC) function will remain active if it was enabled before.
- Even when the headphones are off, you can still press and hold the ANC button to enable noise cancellation without connecting via Bluetooth.
Bluetooth Connections
Connect Using the Bluetooth Menu on Your Mobile Device
- Hold Multi-function Button for 2 seconds until you hear “Power on” and the status light blinks blue for I second.
- On your device, enable the Bluetooth feature.
- Select “Cocl4” from the device list.
- Once connected, you hear “Connected” and the status light glows blue for 2 seconds.

Reconnecting a Device
When powered on, the headphones try to reconnect with the most recently-connected devices.

Connecting Another Device
- Disconnect audio on your previous mobile device to make it discoverable by a new one.
- On your new device, go to Bluetooth settings, then tap “Cool4” to connect.
- Disconnect “Cool4” from your previous device.
- Connect to “Cool4” on your new device.

Disconnecting a Device
You can use Bluetooth settings on your device to disconnect. Disabling the Bluetooth feature disconnects all other devices.
Clearing the Bluetooth Paired Device List
- Delete your headphones from the Bluetooth list on your device. Repeat for each previously-connected device.
- All devices are cleared, and the headphones are ready to connect.

Button Controls

Music Control
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Play/Pause: Once click | |
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Next Track: Double click+ | |
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Volume +: Once click |
Phone Call Control
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Answer Call: Once click | |
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End Call: Once click | |
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Enable/Disable Voice Assistant: Double click | |
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Previous Track: Double click- | |
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Volume -: Once click | |
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Reject Call: Press and hold for 29 |
Change the Noise Cancelling Mode
- Press the “ANC” button 2s to change mode: ANC On

Using Noise Cancellation Only
- Do one of the following:
- Disconnect your device.
- Turn the Bluetooth feature off on your device.

- Press the “ANC” button 2s to change the mode.

Game Mode
Double click the “ANC” button to toggle between Gaming Mode (Ultra-low Latency Mode) and Music Mode.

Reset
Factory Reset
With the earbuds powered on but not connected to any device, press and hold both Volume + and Volume – Button for 5 seconds.
You will hear “power off” and the red and blue lights will flash simultaneously 3 times reset is now complete.

When to Reset Your Headphones
You should perform a reset if you encounter any of the following issues:
- The headphones cannot be found by the device you wish to connect.
- The headphones frequently disconnect from your device.
- Audio is only coming from one side.
- There is no sound even when the headphones are connected, and both the device and headphone volume are set to maximum.
- The audio is out of sync with the video.
Wired Listening Mode
Connect the AUX Audio Cable
Use the 3.5 mm audio cable to listen to audio from your source device when a Bluetooth connection isn’t available.

NOTES:
- In the on state (headphones must have power): Plug in the 3.5mm audio jack to enter AUX mode and manually play music/Press and hold the ANC button for 2 seconds to enter noise cancellation mode.
- If the battery is depleted, use the USB cable to connect to an external power source, then power on the headphones.
- Phone calls and media playback controls are disabled and must be controlled on your source device.
- Bluetooth connection and microphone voice pick-up on the earcups are disabled.
- For the best experience, a Bluetooth connection is recommended.
- Connect the cable to the 3.5 mm port on the earcup.
- Connect the other end of the cable to the 3.5 mm port on your source device.
Charging
Charging the Headphones
- Connect the small end of the USB cable into the USB-C port on the earcup.
- Connect the other end into a USB-A power source such as a computer or wall charger.

NOTE: Charge your headphones regularly to ensure you have enough battery for listening to music each time.
Maintenance
Cleaning the Headphones
The headphones may require periodic cleaning. If the headband or other exterior surfaces need to be cleaned, gently wipe with a slightly damp cloth
- Use only a water-dampened cloth, Don’t use cleaning products. Don’t allow any moisture to enter the headphones through the ports or earcups.
- Don’t force any dirt or debris into the ports. Don’t blow air into or vacuum the ports or the interior of the earcups.

Storing the Headphones
The earcups rotate for easy, convenient storage. Place the headphones flat into the case.
- Rotate both earcups inward so they lay flat.
- Fold the left earcup up toward the headband.
- Place the headphones flat in the case.

NOTES:
- Make sure to power off the headphones when not in use.
- Before storing the headphones for more than a few months, make sure the battery is fully charged.
Battery Warning
Using the wrong battery can cause fire and other hazards (for example, in the case of some lithium battery types)
- Disposal of a battery into fire or a hot oven, or mechanically crushing or cutting of a battery, that can result in an explosion.
- Do not leaving a battery in an extremely high temperature surrounding environment that can result in an explosion or the leakage of flammable liquid or gas.
- A battery subjected to extremely low air pressure that may result in an explosion or the leakage of flammable liquid or gas.
FCC Caution
Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
- This device may not cause harmful interference, and.
- This device must accept any interference received, including interference that may cause undesired operation.
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 receiver.
- Connect the equipment into 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 equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
ISED Warning
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions:
- this device may not cause interference, and.
- this device must accept any interference, including interference that may cause undesired operation of the device.
The device is compliance with RF exposure guidelines, users can obtain Canadian information on RF exposure and compliance.
Caution
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS
The symbol indicates DC voltage
Recycling
This product bears the selective sorting symbol for Waste electrical and electronic equipment (WEEE). This means that this product must be handled pursuant to European directive 2012/19/EU in order to be recycled or dismantled to minimize its impact on the environment.
User has the choice to give his product to a competent recycling organization or to the retailer when he buys a new electrical or electronic equipment.
This product can be used across EU member states.
The device is low power device, it can meet the requirement of the RF exposure.
Notes:
- High Sound Pressure
- Hearing Damage Risk.
- Do not listen at high volume levels for long periods.
Customer Service
If you need assistance with your headphones, please contact us through the Amazon Message Center.
You may also reach our support team at:
Phone: +1 (617) 997-0009 Mon.-Fri.
Email: support@boloxa.store
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Made in China

Documents / Resources
![]() | COOL4 Wireless Headset |
References
- User Manualmanual.tools









