MW809STH education projector enhances interactive learning & classroom collaboration with outstanding picture quality, high brightness, and short-throw capability. Smart installation flexibility combined with reduced maintenance & ownership costs make MW809STH the ideal choice for today's schools. Anti-dust accumulation sensor resists dust buildup Incorporating color wheel sensors with an ingenious anti-dust accumulation feature, MW809STH prolongs optimal performance by rejecting dust which can accumulate on traditional sensors to block the IR signal & cause flickering, abnormal colors, or even shutdown. Unobstructed instruction without space constraints Offering a big screen in short distance with a short-throw ratio, MW809STH eliminates distracting shadows & glare for students & teachers to engage & collaborate freely in front of the board. Uncompromised high brightness MW809STH produces high ANSI lumen brightness & resolution for perfect projection performance with crisp images & sharp text even in bright lecture room. High brightness provides clear content under high ambient lighting, allowing lights to be kept on during classes for note taking & interactive collaboration. Bigger images Ben Q education projectors offer a range of resolutions & projected image sizes to meet diverse classroom needs. Featuring crisp image quality up to 120 inches, the ultra-short throw education projectors deliver increased classroom versatility at reduced costs. Crisp readability via high contrast ratio Ideal for text, numbers, and tables widely used in instruction, Ben Q education projectors leverage the native DLP advantage of digitally controlled micromirrors. By completely toggling off reflective micromirrors to generate deep true blacks, Ben Q education projectors create high native contrast ratio for sharp readability & crisp resolution at every single sub-pixel. Intuitive setup Reliably accurate in any ambient lighting, Point Write auto calibrates & saves its settings immediately when plugged into a computer's USB (Universal Serial Bus) port, remaining ready with no manual configuration or complicated training for teachers. Digital shrink &shift Ben Q education projectors allow convenient screen size fine tuning through OSD menu to significantly save setup time, without need to physically adjust projector installation in case the sensitive short-throw image is not precisely aligned on the desired frame.