This is a replacement/spare headset for the Plantronics CS510 wireless headset system. It includes a rechargeable battery that affords up to 9 hours of talk time. The monaural headset features a noise-cancelling microphone which is useful to eliminate background noise. It has a DECT 6.0 wireless technology and a wireless range of up to 350' (106.7m). It also features hearing protection measures including SoundGuard, Time-Weighted Average, and Anti-Startle technology. This headset comes with lightweight stability and improved performance all with the same reliability for hands-free productivity that has made the CS family a best-seller for nearly a decade.