The Plantronics CS540 Wireless DECT Headset System features a streamlined design and improved performance all with the reliability for hands-free productivity that the CS family is known for. With one-touch call answer/end volume control and mute you can manage calls from up to 350 feet away from the charging base. The CS540 system also enables you to conference in up to three additional headsets for easier collaboration. Voice-dedicated DECT technology provides better audio and eliminate interference from WiFi networks while advanced wideband audio provides high definition voice quality. An extended boom and noise-canceling microphone filter out background noise so listeners can hear conversations clearly.