The Sennheiser SDC 8200 C chairman's unit is an ideal choice for both mobile and fixed conference systems. Its compact and elegant design harmoniously blends in with any conference room. The unit features a high-quality built-in loudspeaker, providing excellent sound at a pleasant volume. By pressing the Mic key, the chairman can make a comment any time. Three voting keys allowing electronic voting: Yes, Abstention, No (+, 0, -).