*** DISCONTINUED - Replacement model: Plantronics CS530 *** Avaya SupraElite Wideband Headsets set the standard for audio quality, lightweight comfort all with a stylish and professional design. Built for the user for whom the telephone is essential, the SupraElite Wideband Headsets expand on the classic corded headset style and functionality, incorporating improved high fidelity audio quality. Features: 3 hours for 100% charge Binaural design directs sound to both ears, greatly improving the clarity and comprehension in noisy environments Noise-Canceling microphone Headset Controls Volume, and call answer/end Mute Up to 300 foot range Security/Privacy 64-bit digital encryption User Density Unlimited (subject to range degradation and environmental conditions) Talk Time Up to 10 hours Compatibility All major corded desk phones Wearing Style Over-the-head Standby Time: Up to 50 hours Operating Frequency Voice-dedicated DECT 6.0 (1.9GHz) Headset Microphone Noise Canceling LightWeight 2.5 oz Battery Recharge Time 1 hour for 5 hours talk time