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.

• Comes with 32-page book, electronics module, LED, photo detector, contact switches, alligator clip, gadget dock, double-sided gadget covers
• Includes a 32-page instructional book with Klutz certified crystal-clear instructions
• Push-button sound machine, motion sensor, light sensor, door alarm
• Recommended for children ages 8+