4M Tin Can Calculator Create green energy by making your own batteries using recycled soda cans and pencils. This set teaches you the science of creating electricity in a fun hands on experiment. Your assembled tin can battery generates enough juice to power the included calculator for hours. Made using safe and high quality materials, this product is designed to last. Give the gift of science with toys and gadgets that foster curiosity and encourage scientific learning. Recommended for ages 8 and up. Challenge your child's imagination with 4M toys and kits. 4M educational toys cover a wide range of educational subjects and include science kits, arts and crafts kits, robotics kits, and more. 4M offers a wide range of toys and kits to let you build a clock, crochet a placemat, or turn your room into a planetarium--all in the name of making learning fun. Create electricity using recycled soda cans and pencils Make your own batteries Learn the science of creating electricity in a fun hands on experiment Part of the Green Science Series from 4M For ages 8 and up