Plantronics CS540 Wireless Headset System[84693-01] Convertible S12 Headset features a new headset design, streamlined base and improved performance. Go mobile and multi-task up to 350 feet from your desk with answer, end and mute controls at your fingertips. HL10 Handset Lifter adds remote answer/end convenience; or choose an Electronic Hookswitch Cable to add remote answer/end call capability, eliminating the need for a Handset Lifter. DECT 6.0 (1.9Ghz) technology provides better audio and eliminates interference from Wi-Fi networks - An extended boom and noise-canceling microphone filter out background noise, so listeners can hear conversations clearly. Plantronics