Make sure that the device you want to connect to is on and in pairing mode. Press and hold the center button on the inline microphone for 3-5 seconds. (We recommend putting one ear tip inside your ear to hear the audio prompt) You should here "powering on.....pairing" as it searches for your device. The Tune 205BT headphone should appear on your discoverable devices and should connect within 2-3 seconds. If you wish to pair to a different device, make sure the last device it was connected to has the bluetooth turned off. Make sure the headphones are off and press and hold the center button between 3-5 seconds or until the audio prompt states that it is "looking for device" You should be able to pair with a different device within 2-3 seconds.