Features: Compact size, lightweight and portable, easy to carry around with you. Color OLED display, you can see the remaining electric quantity, real time voltage, welding gears, delay time and phase time. 110 gears of output power adjustable(press left button to increase 5 gears, press right button to reduce 1 gear), the welding process is more accurate and the welding effect is more perfect. 1-20 gears: suitable for welding thin nickel sheet and mobilephone battery(compatible with various of mainstream batteris of mobilephones models). 20-80 gears: suitable for welding medium thickness iron sheet and nickel sheet. 80-120 gears: suitable for welding thick nickel sheet and iron sheet. Type-C interface design, with fast-recharging function, which can be used as recharge pal and the max output current is 2.1A. USB interface has max 2.4A input current for recharging the spots welding machine quickly. Copper welding pen, with fine conductivity and low contact resistance, quickly detachment and easy carrying. The spots welding pen is consists of multiple strands of high temperature wire with fine torsional resistance ability. Two kinds of welding pens adjustable, you can choose 0.15mm or 0.2mm according to your welding demands.