1. A compact and versatile spot welding device that can be powered by a lithium battery and a 12V car battery. It is suitable for use at home, in the workshop, or outdoors. 2. Main features: - Dual power supply: Powered by a lithium battery or a 12V car battery, suitable for both indoor and outdoor use. - Quick replacement: The welding pen and input wire are connected via U-shaped cold-pressed terminals - can be quickly and conveniently disassembled or replaced. - Precise control: The single-chip microcomputer controller ensures precise control of output pulses. - Information-rich LCD display: Clearly shows the set welding parameters. - High-quality structure: The 2-ounce copper power board ensures reliable operation, and the 10 AWG multi-layer flexible wire leads allow you to work with higher currents. - Automatic and manual operation modes: You can choose automatic welding or use manual startup as needed. 3. Applications: It is very suitable for spot welding, especially for welding battery connections or fastening small metal parts.