Super Bright: Fits 2X2" mounted slides and 35mm film strips and negatives. 3x Magnified Glass Screen: Bright and Even Lighting, No Color Cast, Cool White LED Illumination. Convenient: Desk Top Portable Viewer, Have Eject Button and Slide Tray. Power Supply: optional DC 6V 500mA adapter Or 4*AA Batteries (Not Included). Note: the slide need to insert on the back of the viewer.If you have any questions, please contact us immediately.