This product is a marvel. The helmet up over his head, he is completely forgotten. No pressure on the ears and felt no weight. A very good performance in all the movements of the head, is easy to use with glasses. The battery charge is excellent. (Better than my iPhone 4) FINALLY Sennheiser sound is a true delight for the ears. You get into an auditorium. High dynamic sound, the crystalline treble, bass impressive. We are inclined to the world of great references like "Bose" "Cabasse" "Sennheiser" and some other ... Note that the MM100 is a helmet for receiving phone calls. (Very well done) The scope of the Bluetooth is ten meters around. I highly recommend this product that I use with an iPhone 4.Sennheiser - Stereo Bluetooth Headset for Mobile Phone
