The projector is double sided and features two different modes: stationary and moving! The moving side features two layered translucent domes that rotate slowly, projecting moving stars onto any surface for a truly immersive celestial experience! The Discovery Toy Space and Planetarium Projector features 4 discs of 8 slides each for a total of 32 slides! Use the slides with the stationary projector side: insert the disc and you can project the images onto a wall. Manually rotate the reel to view the next slide. For best viewing results, use the projector in a dark room, and hold the projector close to the viewing surface. (Note: the disc protrudes slightly when inserted into the projector as shown in the photos). Specifications: Dimensions: H:33.0 x W:12.7 x D:27.9 cm Colour: White Batteries Required: Yes Model Number: 1423000801.