This headset works very well with my Motorla E815 phone. I had a similar style over the ear plantronics headset that I had become dissatisfied with. It had been okay for a couple of years but the sound quality was deteriorating and I was looking for a replacement.The first day I had the Voyager 510 I called my wife while I was using the lawn mower to test the noise reduction technology. I was pleasently suprised that she was able to hear me quite well. I have been using it mostly while on the road and I have not had a single complaint about the quality of the sound. When I pushed my Dad to be descriptive he said"Well, maybe it's a little bit tinny but I can hear you just fine."I can certanly live with that. Excellent product that lives up to its hype.