Features: 【 Easy Welding Experience】This electronic small plane set uses highly quality to ensuring precise docking of each component. 【 Fun Learning Tool 】 Through CD4017 flowing lamp circuit design, users can intuitively understand the working principle of electronic components during the assembly process.Outstanding visual effects 【 The flickering LED lighting effect 】not only enhances the viewing experience of the finished product, but also provides a unique visual experience at night. 【 Convenient Assembly Process Model】Block design makes component installation easier and can be completed without the need for additional tools. 【 Using highly quality PCB board】 it has good heat resistance and oxidation resistance, extending the service life of the product Specifications: Product Name: Small Aircraft flashing Circuit Production set Product model: TJ56-684 Size about 105mm/4.13in Working voltages: DC3-6V (Need 2 CR1220 button batteries do Not include) Package Includes: 1 Set of electronic small aircraft flashing circuit production set note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.