The Plantronics AWH450N Supra Plus wireless headset for Avaya system phones is specifically designed to work with the Avaya system. The headset is built for heavy use & ideal for people taking & making regular, lengthy calls. By having a noise cancelling microphone, a large percentage of unwanted office background noise is cancelled out, resulting in a much clearer conversation. In addition to this, its Quick Pair feature allows shift workers who may own their own headset but share a base unit, to quickly & easily register the headset at the start of their shift at the touch of a button. With the Supra Plus wireless headset, you can stay mobile all day with an array of features that are directly accessible from the earpiece, for example, volume & mute control. With its in-built hook switch, calls can even be answered & ended away from your desk, giving you more freedom in your workplace.