The Bluetooth Headphones will not charge.

If your Bluetooth headphones cannot be charged, there may be a loose connection or the battery may need to be replaced.
Try the following steps to troubleshoot the issue:

1. Make sure to use the supplied USB cable. The headphones may not charge if another USB cable is used.
2. Verify that the USB cable is firmly connected to both the headset jack and the USB port on the computer or power adaptor.
3. Make sure that the USB cable is connected directly to the USB port on the computer or power adaptor and not through a USB hub. Charging will not be completed with an indirect connection.
4. If possible, try plugging the USB cable into a different USB port in the computer or a different power adaptor.
5. Make sure that the power for the computer or power adaptor is turned on.
6. Verify that the computer is not in standby or hibernation mode. Charging will not be completed if the computer is set to these modes.
7. If the headset is not used for a long time, the headset indicator may not light up when you connect the USB cable. Do not disconnect the USB cable. Wait a few minutes to see if the indicator lights up.
8. If the product is not used for a long time, the battery may be depleted. The product should improve after recharging.
9. The battery may need to be replaced if the life of the battery drops to half the normal length.
10. It is recommended to charge in a place with an ambient temperature between 15 °C and 35 °C (59 °F - 95 °F). Efficient charging may not be possible beyond this range.

If the issue is still unresolved, service may be required.