Top has a large clear plastic window for best viewing of the incubation and hatching process. Picture window is double plate plastic with air space insulation to help eliminate moisture buildup, which would obstruct viewing. Large viewing area is ideal for classroom work, science projects, advertising and promotional work, and for group observation of the hatching processes. Will hold any size egg, from 120 small Quail eggs, up to 42 large duck eggs. Dimensions: 18" x 18" x 9 1/2", 220 VOLT AC. GENERALLY FOR COUNTRIES OUTSIDE THE UNITED STATES.