Description The item is an optics experimental equipment, with premium material, durable and portable. It's a demonstrator for the synthesis of three primary colors of light, deepen students' understanding of three primary color light sources. Improve students' practical ability and thinking ability. Features - Color:Black. - Material:Plastic. - Size: 14.00X11.20X8.00cm/5.50X4.40X3.14in - Battery: 3AA Batteries (Not Included). - Made with premiumquality plastic material, sturdy and durable for long term use. - This color mixing demonstrator is simple to operate and improve the teaching interest. - Visually demonstrate the principle of three primary color to make it easier for students to understand. - Due to the simple operation design make the experiment easier to operate. - Suitable for optical grouping experiment of junior high school physics students. Package list: 1 x Color Mixing Demonstrator