The revolutionary design of the Model 1850 boasts a new inverted-head design that lowers overall projector height by a full 5-1/2 inches so audiences see your presentation not the projector. The 3M Overhead Projector Model 1850 comes with hush-quiet cooling fan for more enjoyable presentations convenient carrying handle and fold-down post for easy storage and transportation and handy power-cord wrap. There's also a thermal-protection circuit that disconnects power to the lamp if in the unlikely event the projector overheats and a practical lamp ejector that makes replacing lamps simple.