This DIY welding kit is used to install a fun mini- game kit. The working principle of this kit is: using the Ampere force generated by the electromagnetic field in the electromagnetic system to accelerate the metal rod. This is a great DIY electric kit, you be more familiar with electronic components and learn more interesting electronic knowledge. The kit requires little soldering, wiring the circuits, and assembling the components. This is not exactly a beginner project, but a good project for someone with experienced supervision or basic skills. With 60 solder points and 64 components, you can learn relevant circuit knowledge as well as improve your hands-on skills. Turn on the power switch, the green LED lights up, and the circuit starts to charge the capacitor. 1) After waiting for 10-, the blue LED lights up. Insert the cylindrical metal rod from the rear end of the plastic tube, and its tail should be flush with the tail of the tube. 2) the launch button (red button), the metal rod fly out, and the launch is completed. Do not touch the metal parts with your hands when the power is on. The completed project is a device working under high voltage. Although the energy is small, the insulating high transparent Acrylic shell provides its safety. 1) Please discharge the energy storage capacitor before troubleshooting. 2) Under 15 years old, installation and use must be under adult supervision. Designed for students, hobbyists, and educators, this kit is an excellent educational tool for hands-on learning of mechanical and electronic principles. Colour:As Shown Material:Metal Package Contents: 1 x soldering project kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.