Type: Bluetooth Car Kit Applicable models:For all types of rear-mounted CD players, such as Alpine, Pioneer, Clarion 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 voltage: 5-12V Total 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 voltage, the maximum should not exceed 14V, otherwise the voltage 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 Choose from your radio, then you can use your phone to play music 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.