4M Tin Can Robot The 4M Tin Can Robot teaches the value of recycling by repurposing a used can into a fun and functional robot. No special tools or knowledge required; the kit contains detailed instructions and all the necessary parts. Just add a used soda pop can and let the fun begin. Use the kit to create a silly robot or a motorized monster, or a combination of the two. Requires one AA batteries (not included). Recommended for ages 8 years and up. Works well and long with Polaroid Batteries.