design, 99 gears of output power adjustable, more accurate welding, suitable for welding thousands of points on nickel/nickel-plate sheet continuously. With the 3 bit digital-tube real-time gear display function, which not only can display the current gear, but also can detects the battery voltage. Three working modes design, you can switch between general power mode, strengthen power mode and superb power mode. It supports 0.1-0.2mm nickel welding sheets and the welding points are more solid and beautiful. You can choose one of the following sources as your working power source: 1. Leadacid Battery: 2*20Ah electromobile battery, 36-405H new car starts battery. 2. Model Battery: 3S 4000mah 35C, 3S 5000mah 25C, 3S 8000mah 20C. 3. Car Starting Supplies: 11.5-14.8V 36-60AH, the internal resistance should ＞ 2.5 milliohm and ＜7 milliohm. 4. Self-assembling Battery: 11.5-14.8V, total internal resistance ＜7 milliohm. Specifications: Name: Spots Welding Machine Set Material: printed circuit board Type: with housing, without housing (optional) Working voltage: 8-24V Working current: ＜20mAh Peaks welding current: 2400A max Standby power consumption: ＜0.5mAh Welding thickness: 0.1-0.2mm Limit temperature: 175℃ Item size: 89 * 54mm / 3.50 * 2.13in Item weight: 100g / 3.53ounce Package size: 150 * 120 * 20mm / 5.91 * 4.72 * 0.79in Package weight: 155g / 5.47ounce Packing List (without housing): 1 * Control Board 2 * Input Cable 1 * Pair of Welding Pen 2 * Heat Shrink Tubing 4 * Screw Set 1 * 5m Nickel Sheet OR Packing List (with housing): 1 * Control Board 2 * Input Cable 1 * Pair of Welding Pen 2 * Heat Shrink Tubing 4 * Screw Set 1 * 5m Nickel Sheet 1 * Housing