畅销产品
Electrical parts provide students grades 2 and up (age 7+) with hands-on experience designing and building models of working electrical circuits Snap-together parts require no tools and ensure correct connections Includes 30 parts, and instructions for over 100 projects, including working models of a photo sensor, a flashing light, and an adjustable-volume siren Requires 2 AA batteries (sold separately) 
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