Make sure the unit is fully charged
To pair it with a Bluetooth Device, make sure the device is off. Then hold the power button down for 10-15 seconds or until the LED lights flash Red and Blue
If the Mobile device is asking for a pass code type 0-0-0-0, it usually won't ask this option
It the Headphones will beep to indicate that it is paired correctly and the Red LED will turn off and you will see the blue LED will slowly starts flashing once properly paired.
If you cannot hear anything make sure the volume on the headphones and the Mobile device are high before and after pairing