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Level up your prank game with simple, elegant science.
This set includes 4 gadgets and 9 possible sounds to play a total of 20 dastardly, unexpected tricks on the unsuspecting world. The gadgets, (motion sensor, light sensor, door alarm, and push-button sound machine,) operate together with the sounds (danger alarms, screams, sad trombones, or flatulence) for up to 36 combinations! The 32-page booklet explains exactly what to do. With an electronics module, LED, photo detector, contact switches, alligator clip, gadget dock, and double-sided gadget covers, you've got everything you need to lay the smack down on little siblings, friends, or parents with these harmless and creative pranks of the 21st century!
Record voices, music or any sound & use as a buzzer - fun.$24.99
Nine year olds are clever little fellows and have lots of interests. Great presents for 9 year old boys are remote controlled cars or flying objects, science construction kits, anything that shoots, or outdoor gear. Magic is popular and anything involving pranks will appeal to that 9 year old sense of fun. Or get them a great book.