Hello I'm very satisfied with the speakerphone. Have they now 3 weeks and tested both of the interlocutors as well as the participants of the Bluetooth can communicate very well. Even the test highway with my golf 4 diesel at 130 km / h has mastered the speakerphone very good. Only I got the interlocutor with that some noises are zunehemen true, so 1 star deduction. Otherwise, highly recommended especially the connection to the radio made this device very interesting. Listen namely now my music from your phone. And the caller can be heard very well on the car speakers. My two phones are connected promptly after turning on the device.