This is bluetooth module is made specially for BMW vehicles.Compatitible with 09/2002 or newer BMW E46 3 Series Business CD head units ONLY (E46 with  SA 661/650)

There is filter inside so when you switch between CD and AUX,the sound volumn is same.

Easy to install:

1.Insert the Black 8pin connector to the radio

2.Connect the red wire to 12V+, the black wire to 12V-

3.Pair your phone or pad with bluetooth module.

4.Choose Aux from your radio

5.You can use your phone to play music through car speakers.

Cable length:25cm.

High quality!!!