Sennheiser D 10 USB ML Headset - Mono - Wireless - DECT 6.0 - 590 ft - 150 Hz - 6.80 kHz - Over-the-head, Over-the-ear - Monaural - Supra-aural - Noise Cancelling Microphone - 506414 Sennheiser D 10 USB is a streamlined single-sided wireless DECT headset connecting directly to the softphone/PC to provide uncompromising sound for office professionals working in Unified Communications environments. Sennheiser Voice Clarity and noise-cancelling microphone optimize speech intelligibility. Designed for all-day use, D 10 USB is a lightweight headset with 2-in-1 wearing style (ear hook and headband). Features include phone conferencing, hot desking and Sennheiser ActiveGard hearing protection against acoustic shock.