4M Enviro Battery Light up an LED bulb or sound a buzzer using natural energy sources like a potato, salt water - even mud. The Enviro Battery kit teaches children that surprising sources of energy can be found in a wide variety of natural sources. The kit includes wires, zinc and copper plates, plastic cups, an LED lamp, and more. Includes a detailed guide for performing a wide range of experiments. Perfect for young scientists with an interest in electronics and green energy sources. Recommended for ages 8 years 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. The cleanest energy sources you could find on earth An amazing environmental science kit A unique experimental kit that inspires young scientists Fun for the whole family Turn the kids onto the notion of leaving a smaller carbon footprint