How to Enter Bluetooth Pairing Mode
Make sure that the earbuds are off. From there, hold the MFB until the LED indicator alternates between flashing RED & BLUE.
Note: If you are turning on the earbuds for the first time, or if the earbuds are not connected to a device, the earbuds will automatically go into pairing mode (the LED will flash RED & BLUE.)
In the Bluetooth settings menu, locate "Avantree NB26". If the headphones are in pairing mode, it should say "Ready to pair" underneath "Avantree NB26". Click "Pair" to connect the headphones.
After connecting the headphones, the LED on the headphones will occasionally flash BLUE. On your device, there may be a pop-up indicating that you are connected. Otherwise, you can check the Bluetooth settings and "Avantree NB26" should appear as connected.