Kaiser Diascop Viewer with 3x lens is a plastic, free-standing slide viewer with a 3x magnifying lens. It is for slides and filmstrips up to 5x5cm. The unit is equipped with a stacker which holds slides once the "eject" button is pushed. It has a user replaceable lamp (25v, .3a) as well as an "ON/OFF" switch. Requires 2 "C" batteries (not included). Will also accept 3V DC converter (cat.# 202009, not included). Measures: 3.1 x 6.3 x 6.7" (80 x 160 x 170 mm))