HT4186-Q - Power & Charging Related – Avantree Support

Before You Start: Charging or power issues may be caused by a loose USB cable, an incompatible charger, or insufficient power. The NB16-Q headphones have a rechargeable battery, while the Audikast-3 transmitter must stay connected to USB power to work.

Step 1 – Charge Your NB16-Q Headphones

Solid RED – Charging.

LED OFF – Fully charged.

Connect the USB-C charging cable to your headphones.
Plug the other end into a 5V USB wall charger or USB power source.
Check the headphone LED.

Note: You can charge the headphones at any time without waiting for the battery to run low. They can also be used while charging. Use a standard 5V / 1A–2A USB charger.

Step 2 – Power Your Audikast-3 Transmitter

Connect the USB-C power cable to the transmitter.
Plug the other end into your TV’s USB port or a 5V USB wall charger.
Move the transmitter’s power switch to ON.

Note: The transmitter has no built-in battery and must remain connected to USB power while in use. Recommended power: 5V / 500mA–2A.

Headphones Not Charging?

Make sure the USB-C cable is securely connected to the headphones and power source.
Try another 5V USB charger or USB port.
Try new USB-C cable.
Check whether the headphone LED turns Solid RED.

Transmitter Not Turning ON?

Check that the USB power cable is securely connected.
Make sure the transmitter’s power switch is ON.
If using the TV’s USB port, try a 5V USB wall charger instead.
Try new USB-C cable if necessary.

Still Need Help?

If your headphones are not charging or the transmitter will not turn ON, contact Avantree Support. Please tell us which device is affected and whether its LED turns ON.

Contact Avantree Support →