Convertible DECT headset delivers hands-free productivity, simple plug-and-talk installation, energy-efficient power management, and one-touch controls. Lightweight, wireless headset provides mobility, allowing you to multi-task hands-free up to 350' and magnetic docking. Wear over the ear or over the head. Adaptive power system optimizes for range and talk time so you get up to seven hours of talk time. Premium, wideband audio quality delivers audio performance up to 6,800 Hz. DECT technology provides better audio, eliminating interference from Wi-Fi networks. Noise-canceling microphone reduces background noise interruptions, ensuring great audio quality and easing listener fatigue. Enhanced Digital Signal Processing (DSP) provides more natural-sounding voice. One-touch controls include call answer/end, volume up/down and mute. CS540 headset includes the Plantronics HL10 Handset Lifter that adds more call answer/end convenience.