The Potato Clock uses a pair of ordinary spuds to power a digital clock.</br>This kit includes a digital clock?? wires and prongs; two potatoes are all that's needed to create a working clock.</br>This kit is ideal for young science enthusiasts?? and offers a valuable lesson on the transformative power of green science.</br>Detailed assembly instructions included.</br>No batteries required.</br>Challenge your child's imagination with 4M toys and kits.</br>4M educational toys cover a wide range of educational subjects and include science kits?? arts and crafts kits?? robotics kits?? and more.</br>4M offers a wide range of toys and kits to let you build a clock?? crochet a placemat