you can just Insert this item to the back radio then Connect the red wire to 12V+, the black wire to 12V-.match your phone or pad to bluetoothes module.and Choose Aux from your radio, then you can use your phone to through car speakers.Uses car's AUX signal for HD audio transmission.bluetoothes 5.0 support with aptXs, aptXs HD, aptXs LL. Supports (Receiving Mode). AC6925A stereo bluetoothes chip AC6925A stereo bluetoothes chip.Integrated intelligent voive noise reduction technology to reduce and noise.You can from the phone in your car.You can track up and down the songs from the control panel.You can use TF card to . handfree for phone call.bluetoothes Version: 5.0 Samping Frequency: 44.1/48/96KHz Frequency Response: 20-20KHz Noise Ratio: 95dB Frequency Ranges: 2.402-2.480GHz Max Distance: 15M Distortion Rate: less than or equal to 1% Current: 12V Voltage: 20mA Condition: Supported Vehicles: For Comand (nur NTG2) For A-W169, B-W245 C-W203 & CLK-W209 04/04~ M-W164, -X164, R-W251 mit Audio 20, For Audio 30 Audio 50 ,Comand For W169 for A-class For W245 for B-class For W203 for C-class For W209 for CLK-class For X164 for -class For W164 for M-class For W251 for R-class For W221 for S-class For R230 for SL-class For for -class (2004-2006) For for For For For For For For For For For For For For For For For For etc This product only needs to have AUX interface or the criginal car CD player can be used with AUX interface. (Please consults or confirm that you have an AUX interfacebefore purchasing) colour:black Material:ABS Package Contents: 1 x bluetoothes Module 1 x Mic Cable 1 x User Manual 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.