Plantronics Supra H51 Monaural Headset (Discontinued by Manufacturer) Hands-free monaural headset for people who spend all days on the phone Lightweight 1.7-ounce frame with adjustable click-stop headband Voice tube broadcasts high-quality audio in all but noisiest environments Requires separately sold amplifier to connect to phone Quick Disconnect feature; 10-foot coil cord; 2-year warranty