The CS540 Wireless Headset System by Plantronics is destined to be the new standard in DECT (digital enhanced cordless telecommunication) wireless headsets. DECT technology provides superb audio and eliminates interference from Wi-Fi networks. New headsets can be connected to the base by simply docking them. Once a headset has been docked, you can then begin using it right away with the system. Conference in up to three additional headsets for enhanced collaboration and use the optional Electronic Hookswitch Cable or Handset Lifter for remotely answering or ending calls (each sold separately). Features: Lightweight 0.74 oz Headset Hands-free Operation to 350 ft (100 m) Sleek Contemporary Design One-touch Answer End and Volume Control Advanced Wideband Audio Technology Auto-answer Feature Noise-canceling Microphone Battery Lasts up to 7 Hours