Battery Operated LED Light Ray Box with 7 Grooves Ideal for classroom demonstrations in physics, optics, reflection, refraction and more Includes two slit plates, two blank plates, and one concave lens Rugged ABS Injection molded enclosure Runs substantially cooler than traditional incandescent lamps This ray box in an ABS injection molded enclosure, and delivers bright light but runs much cooler than conventional incandescent lamp models. It uses the latest, cool ultra bright LED technology giving superior white light. Supplied complete with lens, two slit plates, two blank plates, and its own battery power source (requires 2 AA batteries, not included). Box measures 6.25" long, 3.5" wide and 3.25" tall.