DuoSet headsets offer hands-free communication in two configurations. Your hands are free for multi-tasking, whether you use it in over-the-ear or over-the-head configuration. The headset is comfortable and secure, and provides excellent sound quality. As with all Plantronics DuoSet features Plantronics patented Sound Guard Plus and Call Clarity technology and it is easy to use. Quick Disconnect feature places the caller on hold, while allowing users to leave their desk without removing their headset. Please note that this headset comes with a 2.5mm Jack Plug and is only suitable for Dect phones with a 2.5mm socket.