This Miseal mini projection cube measures less than 3-inches per side, but it still manages to create a 112-inch image within a 16-foot throwing distance. The resolution is just 800×600 (SVGA), and its LED bulb only puts out 25 lumens of brightness at a measly contrast ratio of 100:1.

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Tiny 3-Inch Cube Projects Giant 112-Inch Picture [Projectors]