How to Factory Reset / Clear Pairing History of the Slumber? – Avantree Support

You can press & hold both buttons for 10 seconds to clear the pairing history of the Avantree Slumber.

Related knowledge:

Bluetooth devices normally auto-reconnect to their LAST paired / connected device. You might need to make sure the previously used device has Bluetooth turned OFF to avoid interference.
It is important to Reset both the Bluetooth sender and receiver. In the case of cellphone / PC, you can turn off its Bluetooth function and turn it back on.
If it’s still not working, you can email us (support@avantree.com) or simply show up online in our twice daily live Zoom Clinic. We will help you fix it.