This mini spot welder is suitable for welding nickel sheet and lithium battery easily and quickly. It is applicable to repair, home DIY and more welding needs. Perfect Household or Outdoor Portable Spot Welder! Features: Mini spot welder with large output power is suitable for welding 0.1-0.15mm nickel plated steel sheet and 0.1mm pure nickel sheet quickly. Portable and lightweight, space-saving in home, easy to carry outside. Easy to operate, one key turn on or off. 6 gears of output power adjustable, freely switching according to practical needs. Applicable to home use, DIY, maintenance, etc. 2 mobile welding pens are made of 10AWG silicone wire and copper rod, and it comes with 2 protective sleeves. The welding pens allow long welding range and can meet various welding needs. 4000mAh large-capacity lithium rechargeable battery, low power consumption, long usage time when full charged. Made of high quality ABS and PCB, Features great durability and stable performance, has long service life. Advanced power management and software design, non-reset and non-zero during welding. Long press the power button to turn on the spot welding machine, and it will display the last level you used before; short press to add 1 level at one time. Self-check function: when the welding pen touches the nickel sheet, it automatically triggers, and the response time is 0.8s. Note: 1. The product should be full charged before first use. 2. Size and color may be slight different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Black Material: ABS + PCB Input Voltage: 5V Output Power: 6 Levels Adjustable Applicable to: 0.1-0.15mm Nickel Plated Steel Sheet, 0.1mm Pure Nickel Sheet Built-in Battery: 1 * 3.7V 4000mAh Lithium Battery Item Size: 140 * 80 * 40mm / 5.51 * 3.15 * 1.57in Net Weight: 325g / 11.44oz Package Size: 15 * 15.5 * 5cm / 6.10 * 5.91 * 1.97in Package Weight: 414g / 14.60oz Package List: 1 * Spot Welder with 2 Welding Pens 2 * Welding Pen Sleeve 1 * Nickel Strip 1 * USB Cable