Plantronics CS540. Product # 84693-01 (without Lifter). Product # 84693-11 (with 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
