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The 3M Overhead Projector Model 1895 offers a three-element lens for sharp presentations. A low-to-high 3,600 and 4,300 lumens effortlessly hurl images across the largest auditoriums. A breakthrough inverted-head design lowers the overall projector height a full 5-1/2" so everyone sees the screen. A color-tuning dial creates edge-to-edge brightness, and a large stage is big enough to fit oversized transparencies. A hush-quiet fan ensures listeners hear every word of your presentation. And, with the flip of a switch, a lamp changer makes replacing lamps a simple job. It also comes with a thermal-protection circuit that disconnects power to lamps in the unlikely event of overheating and a lamp interrupt switch that prevents premature lamp failure when replacing lamps.