This bluetooth is specially made for Kenwood radio. There is Filter inside so when you switch between CD and AUX the sound volumn will be same. Easy to install: 1.Insert the Black 13pin 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!!!