Description: Featuring educational, this model toy can help children develop their interest in science and their intellectual ability, innovative thinking, hands-on ability. It can stimulate children's interest in learning and curiosity through DIY small production, exercise children's thinking ability, and let children understand abstract knowledge through disassembly and assembly. It will easily attract children's attention because of with vivid color and novelty appearance designs. Made of plastic and electronic component material, it is eco-friendly and safe. The length of product is 75mm, the width is 75mm and the height is 160mm. This product is a wonderful teaching equipment for student science and technology education. Item Name: Handcrafted Inventions Toy Material: Plastic,Electronic Component Features: Safe, Reliable, Creative Battery: 2 x AA Batteries (Not Included) Suitable Age: Over 5 Years Old Reminder: The product is a DIY toy, the color changes with the color of the parts. Size Details: 7.5cm x 7.5cm x 16cm/2.95" x 2.95" x 6.3" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Principle: 1. Hand-eye Coordination Description: Hand-eye coordination refers to the coordination of people's fine movements with visual coordination. The key points for the development of children's grasping skills are five-finger differentiation and hand-eye coordination. The increase in finger flexibility helps to cultivate their self-care ability. 2. Circuit Description: A conductive loop composed of metal wires and electrical and electronic components. The circuit is generally composed of power supplies, wires, switches and electrical appliances. According to the nature of the current flowing through, it can be generally divided into DC circuits and AC circuits. Package Includes: 1 Set of Handcrafted Inventions Toy (Including Wire, Plastic Tube, Aluminum Wire, Short Column, Sheep's Eye Ring, Orange, Connecting Wire, Foam Glue, Square Frame, Battery Box, Buzzer)