The GN Netcom GN 2110 ST Monaural Headset is lightweight, very durable, and extremely comfortable, even if worn all day long. TheGN 2110 ST features a click-stop headband which provides a customized fit and pillow-soft ear cushions rest gently over the ear. GN2110 , Monaural over-the-head, Soundtube clarity headset. GN1200 Smart Cord not included eliminates the need for multiple cords for connecting to different phone systems. It connects between telephones with built-in modular headset jacks and GN Netcom brand headsets. You choose your phone type through the eight-position select switch on the Smart Cord.