The sound quality is decent although the sound saturates at high frequencies. Fine adjustment of the volume of the auxiliary input of the car and the Bluetooth phone volume is required.
The pairing is done automatically if the Bluetooth device to pair is near the receiver when the car starts.
The single button is used to hang up during calls, to pair a Bluetooth device or turn off the receiver.
According to some other reviews, the sound quality of the microphone is poor; during a phone call, my interlocutor often pointed out to me sound distortion and saturation. That's why I put only three stars out of five.
