EDC-2000 Series Basic Conference System Enjoy high-quality and stable meeting within your budget Product Features Max. 265 connected microphones Normal/Chairman/Override/FIFO Scalable for voting Mic activation: button T-type, ring, tree, parallel connection Speaker’s image auto-tracking Built-in loudspeaker 30/45 sec. Mic auto-off 1~9 qty. Open Mic RS-232 one-way control