How to Use the Headphones (Avantree NB15T) Independently with Another Device
Step 1: Turn the transmitter OFF. This is important so that the headphones don’t mistakenly connect back to the transmitter.
Step 2: While the headphones are OFF, press and hold the multifunction button on the right earpiece for 5 seconds, until the indicator LED starts flashing RED and BLUE.
Step 3: Go to your device’s Bluetooth settings. Search for and select “Avantree NB15T” to connect. The headphones’ voice prompt will say “connected”.