CS500 Series (CS540) Convertible Wireless DECT Headset System Wireless DECT Headset System is a wireless headset system that allows users to have the freedom and mobility to move up to 350' from the desk with the ability to answer, end and mute calls. CS540 Features: Hands-free mobility to enable easier multitasking Wireless range of up to 350' Switch between narrowband audio to maximize battery life or wideband, professional-grade audio to enable clearer conversations Use with Electronic Hookswitch Cable or Handset Lifter to remotely answer and terminate calls Volume and mute audio controls at your fingertips Adaptive power system delivers longer talk and standby times Voice-dedicated DECT technology eliminates Wi-Fi interference Advanced wideband audio using CAT-iq technology Choose narrowband mode to preserve talk time or wideband mode for clearer conversations Noise-cancelling microphone filters out background noise Enhanced Digital Signal Processing (DSP) technology provides more natural sounding voice Conference-in up to three additional CS500 or Savi headsets Simply dock a headset to link it to a base Auto-answer option lets you answer and terminate calls by removing the headset from, or replacing it to, the base Backed by Plantronics industry-leading global service and support Available Accessories: Model# HL10 HL10 Automatic Phone Handset Lifter Model# 86179-01 Spare Convertible Headset for CS540