Designed for use in medium to large-sized conference rooms, training rooms, higher education facilities, and houses of worship, the BenQ MH741 4000-Lumen Full HD DLP Projector boasts a 10,000:1 contrast ratio to go with its 4000 lumens of brightness, offering clear images even in areas where the ambient light can't be controlled. Its 1.15 to 1.49:1 throw ratio and 2D keystone correction provide additional installation flexibility, accommodating multiple room configurations. It has VGA, RCA composite, S-Video, and two HDMI inputs, one of which supports MHL connectivity for portable devices. The MH741 also features a VGA output for loop-through to another projector. Its built-in 10W speaker will provide audio, so external speakers may not be necessary. The projector is controllable via RS-232 or the included IR remote.