DuoSet headsets offer hands-free communication. Your hands are free for multi-tasking, whether you wear it over-the-ear or over-the-head. The headset is comfortable and secure, and provides excellent sound quality. As with all Plantronics office headsets, the DuoSet features Plantronics patented Sound Guard Plus and Call Clarity Technology. It's easy to use quick-disconnect feature places the caller on hold, while allowing users to leave their desk without removing their headset. The MO200 is a mobile, corded headset with in-line hookswitch and mute controls.