Plantronics 88285-01 CS520-XD BINAURAL OVER THE HEAD HEADSET W/MIC

900MHz wireless technology. Hands-free up to 350 feet. Extraordinary sound quality. Over-the-head binaural: covers both ears for comfort, focus and blocking out background noise. An adaptive power system optimizes for range and talk time by automatically downshifting to low power when the headset is close to the base to save battery life. Audio controls for volume/mute at your fingertips. Conference in up to three additional CS500 series. Use with electronic hookswitch cable or handset lifter to remotely answer/end calls. Noise-cancelling microphone.