Adjustable noise-canceling headset with microphone * 3-way conference calling * Online and mute indicators * Flash, redial, and hold features * Connects to existing telephone jacks Plantronics T20 Corded 2-Line Convertible Headset Telephone with Adjustable noise-canceling headset with microphone, 3-way conference calling, Online and mute indicators, Flash, redial, and hold features and Connects to existing telephone jacks 2 x Phone Line(s) The Plantronics T20 is a two-line telephone with a convertible headset for hands-free conversations. It features three-way conference calling and flash, redial, and hold functions to enhance your home or office productivity.A red light on the phone's base indicates whether an incoming call should be answered on line one or line two. If you want to place a caller on hold, press the hold button; the light flashes until you press the hold button or the appropriate line button again. By placing one caller on hold, then dialing a second party and connecting the two lines with the conference button, you can have a three-way conference call.The Plantronics T20 comes with a convertible headset that is light and comfortable to wear for long periods of time. The headset features a sturdy headband, padded flexible earpiece and headpiece, and a fully adjustable microphone. The microphone can be worn with the headband or with ear hanging hooks on either ear. The sound quality of the earpiece and microphone is very clear. A tone control lets you adjust the tonal quality of your incoming calls.A noise-canceling microphone eliminates background noise, and makes your voice easily understandable to callers. You can adjust the volume level of the earpiece with a wheel on the side of the phone's base. The headset has a 4-foot cord with an adjustable clothing clip, providing you with freedom of movement. A convenient headset stand attaches to the base and keeps the headset within easy reach.