100% brand new and high qualityThis product is made especially for car stereo / audio.Bluetooth-compatible 4.0 version, also support 3.0 / 2.0.Universal cable, suitable for most vehicle.High-quility, stable characteristics, high reliability.Connect the connector to the back of your radio socket.Insert this item to the radio back, then connect the red wire to 12 v +, the black wire to 12 v -.Match your phone or pad to the Bluetooth-compatible module, and choose aux from your radio, then you can use your phone to play music through car speakers.You can listen to music from your phone / pad / mp3 (they must have blueoth function)Length: app. 260mm(10.24 inch)Material:plasticcolour:blackPackage Contents:12 x Car bluetooth moduleOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.