【Bluetooth 4.1】 Bluetooth 4.1 is adopted, full speed transfer and connection stability are realized, and stereo with 3.5 mm AUX terminal is wirelessized. You can enjoy your favorite songs on smartphones or tablets with high sound quality via audio devices. It is a stereo audio receiver compatible with A2DP, AVRCP, HSP, HFP of Bluetooth. • [Safety] The power supply is connected to a cigar socket charger. By turning on / off the engine of the car, the power supply turns on / off automatically. Since there is no battery in the main body of the product, there is no need to worry about the remaining amount even with a long drive. • [Convenient Operation] You can easily send / return music by returning to the control button on the main unit, accept / disconnect the phone, redial the last number. ※ Volume can not be adjusted from this product. Please adjust the volume directly from the car's audio system or smartphone. In addition, with a magnetic base, it is easily removable from the controller. • [2 simultaneous charging] A three-port charger is attached and two extra ports can charge two devices at the same time.