Features: Snap-together parts design, requires well-connected and no extra tools needed. 40 parts included can be built over 700 exciting projects, stimulate kids' interest in science. Each component has a code printed, makes them easily identifying and operating. Help to develop children's self-learning skills and hands-on experience circuits designing. Encourage kids to design their own electrical devices after they have mastered several of the techniques. Easy-to-follow instructions, family entertaining time, enjoy your parent-child interaction. A great gift gives kids a hands-on education to get familiar with circuits knowledge. W-789 electronics discovery kit help to develop children's self-learning skills and hands-on experience circuits designing. Snap-together parts design, requires well-connected and no extra tools needed, each component has a code printed, makes them easily identifying and operating. Encourage kids to design their own electrical devices after they have mastered several of the techniques, easy-to-follow instructions, family entertaining time, enjoy your parent-child interaction. What's in the box 40 x Circuit components 1 x Illustrated manual