Plantronics CS540 5-Pack Brand New Includes One Year Warranty Product # 84693-01 w/o Lifter Product # 84693-11 w/ Lifter 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. CS540 Features 1.9 GHz Cordless Headset DECT 6.0 Technology DECT™ Security certified Convertible Over the Head / Ear Wireless Noise-Canceling Microphone Enhanced Digital Signal Processing Elegant Magnetic Headset Docking Range of Up To 350 Feet Reduces Background Noise One-Touch Controls Volume / Mute / Call Answer / End CAT-iq Technology For High Definition Voice Quality Clear, Private, Secure Conversations 64-Bit Digital Encryption Charge Indicator Light Up To 7 Hours Talk Time Discreet, Stylized Design Lightweight and Comfortable All Day Optimized for Performance w/ IP Desk Phones Recommended for All Environments, Even Those w/ Loud Noise Levels Related Part numbers C054 CO54 Connects To