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If the headset is already turned on, use the multi-function button to turn it off (press and hold down for 4 seconds), then turn it back on in pairing mode (press and hold for 4 seconds). In pairing mode, its LED should be a constant blue color. If it’s red, that means the headset needs charging. -Make sure that Bluetooth® is active on your mobile phone and put it into Bluetooth® pairing mode. The exact procedure for doing this varies according to brand and model. See your user manual for detail