Very good product at a great price. Long battery life (about a week at a rate of 3 hours per day) A clear and powerful sound. Pairing with a very simple iPhone. Contrary to what I thought, Bluetooth does not empty the phone battery quickly. The buttons next / previous tracks work with iOS 4.1 (even on my iPhone 3G). The phone function also works very well: my interlocutors tell me that in fact, the sound cuts off when I'm not talking to "filter" out background noise, and when I speak they hear me again, very well . Nice product, fairly light, gives a solid feel (but it is probably best not to drop it). Only slight complaint: I who have a somewhat large head, the helmet is a little, and after a while it ends géner ... but anyway it is not advisable to keep too long for the eardrums ...