a) Bring the device into pairing mode. If succeed then ok otherwise move to step (b)

b) Set your Mobile Phone to Airplane Mode and then again set to normal mode, mobile's BT working will back to normal if any small bug is there with BT's working. If succeed then ok otherwise move to step- c

c) Restart mobile phone to refresh Mobile Phone's working and Mobile RF will also back to normal.

If Restart is not available then Power OFF and ON the Mobile Phone.

Now again try and follow the pairing process

d) If device's LED show pairing mode and its name is not visible in BT search result interface, try to refresh BT search result in Mobile Phone.

If still can't see the device name then try pairing process with different mobile phone

Note: If device is working fine with other Mobile Phone then there are chances that issues might be with the previous Mobile Phone as well

e) RESET the device (Neckband)

Reset Process: 

1- Remove device name from Bluetooth Interface

2- Long press the "+" & "-" key together for 3 seconds

3- Red and White LED will start blinking that shows device has been reset