The CC 510 Over-the-Head Monaural Headset from Sennheiser is a single-sided headset designed for office use and other professional communication needs. The CC 510 features a 300° adjustable microphone boom which allows you to position your microphone according to your needs. The sound is received through one ear, just like with a telephone, which makes it easier to get accustomed to using the headset. The single-sided design also allows you to hear what's going on in your environment. This headset features ultra noise cancelling designed to block out ambient noise and make your voice clearer. The ActiveGard technology is designed to protect you in the event of an acoustic burst. The CC 510 monaural headset is TCO certified. It comes with a replacement foam ear pad, a leatherette ear pad, a carry bag, a clothing clip, three colored identification clips, and a microphone windscreen.