1. Practice welding skills: This 3D DIY welding kit is designed for people aged 15 and above, aiming to enhance users' electronic knowledge and welding skills. It is very suitable for extracurricular activities and STEM education. To complete the assembly and welding process, you need a set of welding tools (not included), such as a soldering iron, solder wire, etc. 2. RGB LED lights: After assembly, this welding practice kit will turn into a shining Christmas tree. 36 RGB LED lights emit bright, colorful, and wonderful light at night. The Christmas tree can be used not only for practice but also as a gift and a beautiful decoration, especially during Christmas. 3. Power mode: The DC 4.5V - 5V operating voltage can be directly powered by 3 AA batteries or a USB power adapter (a battery holder and a USB cable are included). 4. Clear markings: Component names are clearly marked on the circuit board so that you can find the placement positions of the components. 5. Double - check: If some components don't light up, make sure all components are in the correct direction and position. Check if the solder joints are good, which is very important during testing. 6. Tip: Please prepare 3 AAA batteries on your own. 7. Dimensions: 6x6 x 13.6 cm 8. Material: Plastic 9. Color: As shown in the picture 10. Package contents: A set of Christmas tree welding project (1 set, 64 accessories, as shown in the picture) Only the above package contents are included, and no other products are included. 11. Note: Light reflection and different monitors may cause slight differences between the color of the items in the picture and the actual objects. Please allow a measurement error of +/- 1 - 3 cm.