The Plantronics CS540 Professional Wireless Headset System gives you premium audio performance and sleek, comfortable styling. The Plantronics CS540 features a top-of-the-line noise-canceling microphone for clear speech even in environments with distracting background noise. The stylized, lightweight convertible design of the Plantronics CS540 is not only discreet; it is comfortable enough to be worn all day. The CS540 has superior microphone and earpiece create a high-performance headset yielding great results for both traditional phone lines and IP telephony systems. The Plantronics CS540 offers wireless freedom with no compromises.The Plantronics HL10 Automatic Headset Lifter enables one-touch call answer/end for compatible Plantronics headset systems. You can enjoy the full mobility of cordless conversations. Roam around your workspace freely, you will be notified when a call is received and you can answer and hang up whenever you choose.