1. Designed using Hall electromagnetic principle to generate magnetic field changes that repel the magnet at the lower end of the pendulum needle, causing it to accelerate the repulsion and swing back and forth. 2. Provide circuit diagrams to facilitate welding operations. 3. This product comes with seven color LED lights flashing, and when connected to a 5V power supply from the DC port, the LED lights are flashing, making it colorful and colorful. 4. Directly printing the identification of components on the PCB board can effectively shorten the welding time and reduce assembly errors. 5. It has a wide range of applications and can be used to learn electronic circuits, cultivate hands-on skills, and also for school teaching or electronic enthusiasts to self learn electronic technology assembly and use. Attention: 1. This product is a DIY kit and not the final product. 2. This welding project requires basic electronic knowledge and hands-on skills. 3. The delivery is in loose parts, which need to be welded and assembled by yourself. Some accessories are sent randomly and cannot be specified, which will not affect the use. Material:Plastic Package Contents: 1 x swing DIY kit loose package