This really is an awesome headset. It is so light, the first wearable technology that actually works.Some of the users here have complained about the sound - that the volume is too low. I thought this was the case until I realized that the top button was for lowering the volume and the bottom was for raising the volume. This can happen if you press the button on the headset for too long a period of time then press the bottom volume button - this sets the bottom button to raise the volume if you wear the headset on your right ear.You can set the volume orientation depending on whether you wear the headset on your left ear or right ear. When I first opened the HS850, I set the orientation incorrectly - with the top button set to lower the volume while wearing the headset on my right ear, so I thought the volume was too low. And, as I pressed the volume button on the top, I would continually lower the volume.Moral of the story: If your volume is too low, try checking the volume orientation. Or read page 22 in the mini manual.You'll find that that the HS850 really is a great headset that is easy to carry, easy on the ear and cool looking. And the sound volume is high enough for almost any situation - riding in a car, walking down a crowded street, or sitting in a cafe.