1. bluetooth 4.0 version, also support 3.0 /2.0, fits WMA, WAV, FLAC. 2. Suitable for 2 Concert 1 2 Symphony 1 receivers. 3. Insert this item to the back radio then connect the red wire to 12V+, the black wire to ground. High-, stable characteristics, high reliability. 4. Match your phone or pad to bluetooth module and choose Aux from your radio, then you can use your phone to through car speakers. 5. You can hear music from your phone/tablet/MP3(Supports blueooth function). Name: bluetooth AUX Cable Model: C45825 Length: 26cm bluetooth Version: 4.0 Material:ABS colour:black Package Contents: 1 * Bluetooth Adapter AUX Cable Only 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.