3 Colour LED Light Source Set-Three light source devices with super luminous red, blue, and green LEDs! Removable cover cap! Use all three colours to learn about the composition of light.Slim shape – align them together to perform experiments. The three separate colours allow you to experiment with the parallelism, diffusion, and convergence of light . Magnets on the bottom make whiteboard presentations easy! Dimensions: 120 x 35 x 20mm Material: ABS Light source: Super luminosity LED Power source: 2x AA batteries required for each light source (included)