Type: Bluetooth Car Kit Applicable models:For all types of rear-mounted CD players, such as , Pioneer, and other navigation machines. car has a stereo with AUX IN lotus female connector, which can be plugged in with the RCA male connector to realize Bluetooth music. Bluetooth name: JieRui-BT 5908 Bluetooth version: 5.0 (compatible with the following versions) Product : 5-12V Length: 23cm You can just Insert this item to the back radio then Connect the red wire to 12V+, the black wire to 12V-. Note: It is suitable for 5-12V , the maximum should not 14V, otherwise the will be too high when the device is powered on and the chip will burn out. Match your phone or pad to bluetooth module.and from your radio, then you can use your phone to through car speakers. You can hear music from your phone/pad/mp3(They should have blueooth function). Colour:black Material:ABS Package Contents: 1 x Bluetooth AUX Audio Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.