The Hitachi CP-WX3541WN 3700-Lumen WXGA 3LCD Projector is suitable for applications ranging from classrooms to conference rooms, combining image clarity, quality, long life, and reliability. Bright colors with sharp text and bold graphics will enhance lessons and meetings alike and make them more memorable. Its 1.5 to 1.8:1 throw ratio will provide versatile placement options. The projector has VGA, USB, and HDMI inputs, plus a VGA output for daisy chaining two or more projectors. Its built-in 16W speaker will eliminate the need for an external speaker system, but if you prefer to have one, the projector also has an analog audio output.