Summary: I felt so sad, because this M155 can not work well. The talk time of M155 should be up to 5 hr according to its manual, but my M155 only can be used for 15-20 min. M155 connected with my iPhone 4S very well, but I just can listen music for 15- 20 min. I tried several times, and the results were the same. Is it a joke? This product was unsatisfactory.
Summary: Disconnects randomly then Keeps saying the bluetooth is connected in bluetooth menu and through the ear piece but does not show up on on call menu and doesn't work. I waste more time rebooting the iphone and screwing with the pairing than I do talking.
Summary: I have been using this product for over a month now. The M155 works fine only in a silent environment which is obviously strictly indoors. I've had multiple callers complain of poor voice quality when outdoors. It's comfortable & affordable, however it works well only when indoors. Hope this helps.