Sennheiser  SH250 Binaural Headset with Microphone Patented active Guard technology to safeguard your hearing Acoustical foam ear cushions effectively channel sound into ears Headband adjustable on both sides for Individually preferred positions Black with dark grey colored C-clamp Completely detachable headband for ease of use Omni-directional microphone with flexible boom arm allowsm for accurate and stable positioning and optimal durability. Ball mounted speaker capsule automatically self adjusts for wearing comfort Active-gard, a patented technology, acts as an automatic control in your headset to instantly lower the volume from acoustic bursts. Detachable headband for easy upgrade to clip on.