DUAL CONNECTION: The hands free speaker supports two mobile phones to connect and jointly control the speaker playback at the same time. HANDSFREE: Support bluetooth mobile phone navigation reminder broadcast, music playback, etc., quick link, easy to opereate, free your hands. PRACTICAL: One click answering and number broadcast to incoming calls, no need to hand held the telephone, double click to replay, to ensure driving safety. VIBRATION SENSOR: Vibration occurs when the door is opened, and the car Bluetooth will automatically turn on and connect with the mobile phone. POWE SAVING: The bluetooth wireless transmission range up to 10 meters, after getting off the car beyond the range within 5 minutes will automatically shut down, greatly saving power.