While the fit (on head ) is excellent, with both the handset and the earphone volume turned the maximum the sound level is about half that of the hand set, making the headset useless. This is all the more surprising as the headset is listed as made for the handset. Also the volume control on the head set wire is not only mostly in the way but the mute feature quite often mutes on it own. I had hoped that it would be helpful with hearing calls ( I'm 81 and need all the volume I can get) however its useless, and I soon as I can find the box it came in I will be sending it back. Perhaps this particular set is malfunctioning , and maybe another set would work as I wanted, so if I could get a return label I would be willing to try another set, but I suspect that it wont be any better.