The CC 520 Binaural Headset from Sennheiser is a dual-sided headset designed to transmit powerful, precise sound to both ears for optimal understanding. The CC 520 features a 300° adjustable microphone boom which allows you to position your microphone according to you needs. The headset's dual-sided design ensures maximum block-out of background noise, increasing concentration and efficiency.This headset's microphone 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 self-adjusting ball-mounted speaker capsules allow perfect fitting to the head. The CC 520 features comfort pads in the headband, which distribute pressure on the top of the head to a greater surface area. The ear caps are specially padded for comfort even during extended wearing time. The CC 520 binaural headset is TCO certified. It comes with two replacement foam ear pads, two leatherette ear pads, a carry bag, a clothing clip, three colored identification clips, and a microphone windscreen.