Your junior scientist will love this Snap Circuits Water Clock Kit from Elenco. Your child can build a Digital Water Clock using the colorful Snap Circuits parts that come with this kit. No soldering is required, and the parts snap together with ease. The digital clock runs on tap water or fruit juice or cola. No need for batteries. This liquid battery also powers a light-emitting diode. The kit comes with an easy-to-read illustrated manual.