Science meets immaturity in this top-selling title with a set of customizable electronic gizmos, along with a book of games, pranks, and jokes. Klutz-clear explanations of the electronic circuitry accompany step-by-step instructions for how to wire (and rewire) your own door alarm, motion sensor, light sensor, and push-button device. It's like a science fair project with the soul of a whoopee cushion. 9-volt battery not included. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.