Tap and hold the Bluetooth icon on your mobile

Turn ON the Bluetooth

Make sure your mobile and the Bluetooth headphone are within 1-meter range

Hold down the multifunction button on Bluetooth headphone for about 3 seconds 

You'll see the LED light starts flashing Red & Blue continuously

Select Tune FLEX

Tap Pair on the pop-up

Once successfully paired, the LED light will flash Blue once every few seconds