The SC 30 USB CTRL Monaural Headset from Sennheiser is a single-sided wideband headset compatible with global providers of Unified Communications solutions. It features integrated call control and a USB connector. The Sennheiser HD voice clarity offers wideband sound for a more natural listening experience. The noise-cancelling microphone is designed to filter out ambient noise, while the single-sided wearing style allows you to hear what is happening around you. The SC 30's pivotable boom rotates through 340° for wearing flexibility on the right or left ear. The boom arm is bendable, which allows you to adjust the microphone's position. The ActiveGard technology is designed to protect you from acoustic shock and sudden sound surges. The call controls allow you answer or end a call, increase and decrease volume, mute the microphone, redial the last outgoing call, and reject an incoming call. The SC 30 USB headset includes a large acoustic foam ear pad for increased comfort.