This bluetooth adapter helps to play phone music through car radio and it supports call answer by microphone For Pioneer for for for for For all cars which have AUX / Audio ports. How to install: 1. Insert the Plug into your car radio AUX / Audio Ports at backside. 2. Connect the small red wire to ACC (12V+) PIN in the power port and connect the black wire to GND (12V-) PIN in the power port. 3. Match your smart phone / tablet PC with this device by bluetooth connecting. ( it's bluetooth 5.0, no password need to connect ) 4. Turn on your car radio and select AUX in your radio audio source list and on your phone. 5. In , you can listen your phone music through your car radio speaker louder, and you can answer calls by the microphone. Material:ABS colour:Black Package Contents: 3 x Audio Cable Adapter 3 x Bluetooth microphone Only the above package content, other products are not included. Note: Light reflection 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.