Sennheiser SC 135 USB is a single-sided headset with 3.5 mm jack and detachable USB cable, optimized for flexible UC professionals working on both PC and mobile devices. Sleek minimalistic design and great sound for calls and multimedia make this a convenient single solution for all your audio needs. Sound profiles adjust automatically to communication and multimedia use. A natural listening experience with Sennheiser voice clarity and noise-cancelling microphone optimize Speech intelligibility and an in-line call control unit enables seamless call management. The bendable Boom arm folds discreetly into the headband when not in use, giving a more streamlined appearance.