A pairing of great simplicity with two phones (Blackberry and Iphone 4S Q5), intuitive use, a newfound freedom of action compared to wired headsets / bluetooth. I had doubts about the quality of sound, quickly raised: only a very heavy rain can make the understanding of the delicate and the corresponding contact are not bothered by the surrounding noise. The major drawback comes from the autonomy of the phone (with the use of Bluetooth it is imperative to provide a cigarette lighter "triplet"). The autonomy of the hands-free kit is about a week in intensive use ... Essential.