(1) Compatible with other versions of 2.0 3.0 4.0 Bluetooth system, supports commonly used MP3 format audio, also supports WMA WAV FLAC and other high-quality audio format decoding, non-common Bluetooth function, can support DSD high-capacity transmission. (2) Simply plug the 12-pin plug into the socket on the back of the radio, connect the red wire to 12V+ and the black wire to 12V-. (3) Match your cell phone or keyboard to the Bluetooth module. Then select Aux from the radio and you can use your cell phone to through the car speakers. Wireless version:5.0 Product voltage:5-12V Fitment. For 207 2006 + for //for RD4 For 307 2005 + for //for RD4 For 307SW 2005 + for //for RD4 For 307CC 2004 + for //for RD4 For 2007 + for //for RD4 For 407 2005 + for //for RD4 For 407SW 2005 + for //for RD4 For 607 2005 + for //for RD4 For 807 2005 + for //for RD4 For 1007 2005 + for //for RD4 For 4007 2007 + for //for RD4 Colour:Black Material:Plastic Package Contents: 1 * Bluetooth Adapter 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.