Product Description Specifications Material: acrylic Package Size:24cm*14cm*2.6cm(9.45*5.51*1.02 inches) Batteries Needed: 2 pieces AAA batteries (NOT included for safety) Suitable for:Teacher/junior high school students Optical Experiments:refraction of light, convex lens refraction, lens refraction, prismatic refraction, plane mirror reflection, diffuse reflection, convex mirror reflection, concave mirror reflection, etc. Package Including 1x Biconvex Lens1, 1x Biconvex Lens2, 1x Biconvex Lens3, 1x Single Concave Lens, 1x Acrylic Glass Tile, 1x Single Convex Lens, 1x Double Concave Lens, 1x Triangular Prism, 1x Three Way Linear Light Source, 1x Multifunctional Reflector 1x Color box 1x English Color page manual Note: 1. Due to differences in monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture. The color of some accessories may be different from the picture, such as the color of the switch. 2. Due to manual measurement, please allow 1-2 cm measurement deviation. 3.Three Way Linear Light Source can be adjusted by using a screwdriver to adjust the direction of light.