Plantronics S20 Telephone Headset Accessory System (Discontinued by Manufacturer) All-in-one telephone headset system for sales professionals and other frequent phone users DuoSet noise canceling headset fits comfortably over the head or on the ears A20 amplifier with SoundGuard Plus and Call Clarity technologies for crisp sound Online indicator lets others know when you're talking on the phone Quick plug-and-play setup; includes headset stand and cord management system