Discover the science of batteries with the Lemon Powered Clock Kidz Labs Science Kit by 4M. This clock is powered by a lemon. Simply add your own lemon to turn this kit from into an amazing lemon-powered clock. 4M Lemon Powered Clock Kidz Labs Science Kit includes copper and zinc plates, wire and a clock. All you need is a fresh lemon! Perfect for science fair projects, classroom experiments, or summer learning fun at home - Lemon Powered Clock Kidz Labs Science Kit is recommended for scientists aged 5 and up!