[. . . ] Call functions Before you can start using the headset, you must charge the battery and pair the headset with a compatible device. [. . . ] Then press and hold the Volume+ and Volume- button until the green and red lights flash alternately. Make a call from your mobile phone in the normal way, the call is automatically connected to your headset. During the call, press and hold both Multifunction and Volume + buttons until hear a tone. Volume up Volume down Making calls Answer call End call Reject call Redial last dialed number Voice dial (phone dependent) Mute & un-mute Light indication The Iqua Essence's LED lights can be green or red. [. . . ] Power on / off Green LED flashes once/Red LED flashes once and then turns off Powered on but no Green LED flashes slowly Bluetooth connection Connection active Pairing mode Battery charging Battery charging completed Green LED flashes twice slowly Green and red LED flashes alternately Red LED is on continuously Red LED is turned off and green LED turns on [. . . ]