Description: DIY analog circuit toy model set, brand new and in good condition Teaching Tools, help students and children learn physical electrical knowledge (series circuit and parallel circuit) Equipped with 2 LED lamp, 2 lamp holder, 6 spring, 2 wire and 1 switch, let kids to apply knowledge to practice This educational toy can stimulate kids' interests of learning and intelligence development Szie: (L*W*H) Approx. 12.5*10.5*5cm/ 4.92*4.13*1.96inch NOTE: Please be careful that an electrical short circuit may cause a fire accident. Material: Plastic Specification: Installation of spring, lamp holder, LED lights, switches, battery. Lamp holder and the switch can be fixed in springs Series circuit: 1 Install wire on the right side of bulb , the end of wire is connected to the second light left 2 the second wire is connected to the right side of other bulb, and the end of second wire is connected to right of switch 3 Battery box anode is connected to the left side of first light 4 Battery box cathode is connected to switch on the left Parallel circuit: 1 The first ware is connected to the left of first light, and the end of it is connected to the left of second light 2 The second wire is connected to the right side of two lights 3 The third wire is connected to the left side of two lights 4 Battery box anode is connected to the left of second light 5 The cathode is connected to switch at the left Package Includes: 2 LED lamp 2 lamp holder 6 spring 2 wire 1 switch