The Motorola HS850 is one of the worst built pieces of equipment that I have ever encountered. We bought 4 units as a trial for our field personnel: 2 of them arrived with faulty boom switches, one had a failed power supply after a week, and the other 2 had faulty boom switches in less than a month of use. The mechanism that switches the device on and off via the boom is flimsy and if not highly unreliable immediately, it will become so after moderate use.Our technical department had the displeasure of repairing one of the headsets and were disgusted by the build and design quality.I'm not the kind of person who usually writes products reviews, but wish I had read a review like this before I ordered the Motorola product.Needless to say we will not be buying in this Motorola product for our staff!