DIY Series Parallel Connected Circuit Toys Students Science Experiments Kits Children Assembling Educational Toy Purpose:Through the experiments of lighting small bulbs, children can understand the basic principles of series circuits and parallel circuits, and cultivate children's exploration spirit of science.Specification:Material: Plastic Metal AccessoriesSize: 9 X 14 X 3.5cm/3.54 X 5.51 X 1.38"Color: As ShownRecommended Age: 5Y  Warm Tip:1. When assembling products that require circuits, please note that the red wire is connected to the positive pole of the battery box; the blue wire is connected to the negative pole of the battery box.2. All products are NOT Including Battery/Pigment/Glue, and the colors of the accessories are random. Do not specify colors. Please read carefully before purchasing.3. It Contains small accessories and sharp objects, children need to be accompanied by an adult, please take care of children to avoid swallowing. Included: 1 Set X DIY Assembling Toys