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. Vibration Sensor: Vibration occurs when the door is opened, and the car Bluetooth will automatically turn on and connect with the mobile phone. Practical: One click answering and number broadcast to incoming calls, no need to hand held the telephone, double click to replay, to ensure driving safe. Handsfree: Support bluetooth mobile phone navigation reminder broadcast, music playback, etc., quick link, easy to opereate, free your hands. Dual Connection: The hands free speaker supports two mobile phones to connect and jointly control the speaker playback at the same time.