Kaiser Mini 3 with Folding Arm is a small, inexpensive, plastic slide viewer. The unit is powered by 2 "AA" batteries (not included) and features a 3x magnifying lens and pull out hinged support bracket for angled viewing. To use, place the slide in the top slot, press down on it, and the bulb is pressure activated on. The viewer measures 3.5 x 2.5 x 2.5" (89 x 63.5 x 63.5 mm) and has a 2x2" viewing area.