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You can do optical experiments by this set of Optical equipment and you can adjust different light with your kids! Have fun!Operates with 2x1.5V, AAA batteries(not included in the package).Box Size: 23cmx16cmQuantity: 1 SetNote:Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bidDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Contents: 1 x Laser Beam generator1 x Triangular prism1 x convex lens1 x biconvex lens2 x square lens(different size)1 x spherical lens2 x mirrors1 x magnifier1 x water channel3 x chess1 x instructionsAAAx2 needed (NOT INCLUDED)