In addition to the power connector of the RCA plugs into the auxiliary jack (line-in) of the car radio is plugged. Now only the small switch at the edge press to turn on and off you go. The connection example. With the mobile phone is child's play. Only activate Bluetooth or NFC, confirm on the phone, the coupling and the connection is established. Of course, the audio system should be on AUX (or Line-In). The sound of played music is clear and without any lag.
Call: If you call while driving, you can answer the call with a single click of the multifunction button or reject with the button pressed. Also can be terminated with a single click the conversation. The microphone is quite good and the handling simple.
The device itself can be glued to a metal disc on the dashboard. A magnet now ensures the necessary stability and the easy removal of the device. In addition to the multi-function button there are two buttons for volume and the coils of music. Some getting used to is the idea that the right-most "+ Volume" key is not intended for usual fast forward, rewind but as with other devices, and vice versa. Strange as it sounds, you get used to it quickly to this situation.
All in all I am delighted with this device. It combines quality and functionality, and offers very good value for money!