First one I received had a defective answer key. Sent it back for a replacement. The replacement unit looked really cool and function well in an ideal situation. However it was way to sensitive to interferance and the range claims didn't hold up to my exerience. It frequently got choppy when more than 2-3 feet from the phone. I'm using Ericsson T68m. I replaced it with the Plantronics M1000 which so far seems to function better.