Ben Q MX825ST interactive education projector offers flexibility & image quality to enrich your teaching. Product Features Anti-dust accumulation sensor Incorporating color wheel sensors with an ingenious anti-dust accumulation feature, MX825ST 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, MX825ST eliminates distracting shadows & glare for students & teachers to engage & collaborate freely in front of the board. Uncompromised high brightness MX825ST 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 these education projectors deliver increased classroom versatility at reduced costs. Long-lasting picture quality With sealed design that protects the DLP chip from dust-induced image degradation & the industrial-grade durability of DLP projection technology, Ben Q education projectors are capable of maintaining long-lasting picture quality by eliminating color decay.