Suitable for beginners: high-quality parts and intuitive design, designed for electronic beginners to learn to weld electronic components. A simple circuit that controls the LED flash through sound, and the LED will shine with the music played by the speaker. Easy assembly: The space between the pad and the pad on the PCB board is large enough, and the assembly is convenient and simple, without complex programming skills. Widely used: suitable for welding skills training, DIY production, etc Note: The product needs to be welded by yourself