Poly CS540A Headset with handset lifter TAA Hands-free productivityTheCS540 convertible DECT™ headset provides professional performance so you can get more done - even on the move. The noise-canceling mic reduces background noise interruptions, ensuring great audio quality and easing listener fatigue.Give everyone more freedom to moveEveryone in the office could use more flexibility. Let them roam confidently up to 400 ft from the headset base. They'll be able to collaborate simply since teams can conference up to four headsets on a single base.The choice is yoursThere's more than one way to make a call - switch up styles to find your groove and introduce your ears to something new. TheCS540 convertible design comes with three wearing options: over-the-ear, over-the-head, behind-the-head .It's just easySimplify desk phone management with headset audio controls and adding either the HL10 Handset Lifter or Electronic Hook SwitchCable (EHC) for remote call capabilities.Extended range and talk timeThe adaptive power system optimizes for range and talk time by automatically downshifting to low power when the headset is close to the base - saving battery life and maintaining maximum density.SoundGuard technologySoundGuard acoustic limiting technology protects against Acoustic Shock by limiting sounds to below118dBAensuring listening comfort and protection against audio spikes.Superior audio qualityYour choice of narrowband audio to extend talk time or advanced wideband audio for high - definition voice quality. Enhanced Digital Signal Processing (DSP) provides more natural sound, delivering clear audio the way it's intended to be heard. Over-the-ear earpiece design cradles the ears giving you the confidence to move around With the wireless Digital Enhanced Cordless Telecommunications technology, answer your calls remotely while multitasking around the workplace Your voice will be heard loud and clear with the boom microphone Stay connected smoothly with a wireless range of 393.7 ft (120 m) Great for Audio/Visual Labs, Assisted Listening Systems and more that have a Mono jack for non-stereo use In-ear earphones for comfortable listening table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Product Type: Earset Battery Rechargeable: Yes Earpiece Design: Over-the-ear Earpiece Type: Monaural Microphone Design: Boom Wireless Operating Distance: 393.7 ft (120 m) Noise Canceling: Yes Taa Compliant: Yes Color Family: Black Sound Pressure Level (A Weighted): 118 dB(A) Color: Black Connectivity Technology: Wireless Product Series: CS500 Brand Name: Poly Battery Talk Time: 7 Hour Features: Wideband Audio Form Factor: In-ear Manufacturer: HP Inc. Product Model: CS540A Product Name: CS540A Headset With Handset Lifter TAA Wireless Technology: DECT Application/Usage: Desk Phone Manufacturer Part Number: 80R99AAABA Manufacturer Website Address: http://www.hp.com Microphone Technology: Noise Cancelling Sound Mode: Mono Sound Pressure Level: 118 dB Limited Warranty: 1 Year Weight (Approximate): 0.74 oz (21 g) Feature1: Over-the-ear earpiece design cradles the ears giving you the confidence to move around Feature2: With the wireless Digital Enhanced Cordless Telecommunications technology, answer your calls remotely while multitasking around the workplace Feature3: Your voice will be heard loud and clear with the boom microphone Feature4: Stay connected smoothly with a wireless range of 393.7 ft (120 m) Feature5: Great for Audio/Visual Labs, Assisted Listening Systems and more that have a Mono jack for non-stereo use Feature6: In-ear earphones for comfortable listening