Power on: Long press the function key for 3 seconds the blue light flashes three times the headset is turned on. Power off: Long press the function key for 3 seconds the red light blinks twice the headset is turned off. Pairing: Long press the function key for 5 seconds alternating red and blue lights flashing the headset enter into the pairing mode. Answer: Press the function key to answer the call. Redial: Redial the last number by Double-clicking key. Sound switch: Double key will leading to switch between headset and phone during a call. Press the function key to end call.