I wanted to go handsfree at home, so I bought this product. The first thing I realized is that the cs50 wouldn't work with my cordless phone. That's because it takes as input the wire that connects the telephone handset to the telephone base unit. So I tried using my corded phone. But that wouldn't work either because the wire could not be removed, this is a problem with most phones where the keypad is not in the base but is in the handset. So I bought another $20 corded phone (29318GE1) and the cs50 worked with it, but the other party could not hear me well. I tried several other inexpensive phones but the clarity was not there. In desperation I tried an expensive phone (an $80 29486GE2), the kind one has in the office, and the cs50 worked much much better with it. I still could hear an irritating echo, but that went away after some tuning. My efforts paid off and I am now very happy with the clarity and the convenience.