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 moduleand Choose Aux from your radio, then you can use your phone to play music through car speakersUses car's AUX signal for HD audio missionbluetoothes 50 support with aptXs, aptXs HD, aptXs LL.Supports TWS(Receiving Mode).AC6925A stereo bluetoothes chip AC6925A stereo bluetoothes chipIntegrated intelligent voive noise reduction technology to reduce echos and noiseYou can play music from the phone in your carYou can track up and down the songs from the control panelYou can use TF card to play music.handfree for phone callbluetoothes Version: 50Samping Frequency: 441/48/96KHzFrequency Response: 20-20KHzNoise Ratio: 95dBFrequency Ranges: 2402-2480GHzMax Distance: 15MDistortion Rate: less than or equal to 1%Current: 12VVoltage: 20mACondition:Supported Vehicles:For Comand (nur NTG2)For A-W169, B-W245 C-W203 & CLK-W209 04/04~ M-W164, GL-X164, R-W251 mit Audio 20,For Audio 30 Audio 50 ,Comand For W169 for A-classFor W245 for B-classFor W203 for C-classFor W209 for CLK-classFor X164 for GL-classFor W164 for M-classFor W251 for R-classFor W221 for S-classFor R230 for SL-classFor for -class (2004-2006)For for For For For For For For For For For For For For For For For For Opel etcThis 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:blackMaterial:ABSPackage Contents:1 x bluetoothes Module1 x Mic Cable1 x User ManualOnly 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.