Features: Digital control: The control board of spots welding machine is equipped with a digital display screen, allowing users to visually view spots welding parameters, such as spacing and spots welding counting, providing precise welding control. Portable design: The product adopts a portable design, which is small and lightweight, convenient to carry and use, and can be flexibly operated outdoors or in the workplace. Accurate welding control: The control board has high-precised welding control functions, which can adjust parameters such as spots welding current and time to avoid unstable welding and damage to the battery. Safety protections function: The product is equipped with various safety protections mechanisms, such as overvoltage protections, overcurrent protections, and short circuit protections, to ensure safety during the welding process. Multifunctional application: Supports 7-14V battery power supply, suitable for welding needs of various DIY battery packs, such as 18650 battery packs, power tool battery packs, etc. Specifications: Material: ABS+PCB Support voltage: 7V-14V, current greater than 200A Recommended power input: Car starting power supply 12V 20A-200A Supercapacitor 3 in series-6 in series Aviation model battery 3S 5000mah and above Note: Reverse connection of the positive and negative poles of the power supply will burn out the control board. This product only includes the control board and welding pen, and does not include power supply, battery or aircraft model batteries. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Package includes: 1x Portable Spots Welder Control Board Set