MOS tubes*5. After 5 parallel connections, the theoretical maximum current can reach about 1700A. Five MOS tube positions are reserved on the back of the PCB. This is convenient for players who are familiar with electronic knowledge and have hands-on skills. Add MOS tubes by yourself to increase DIY fun. Gears 0-99, gear 1 is the lowest, gear 99 is the highest, increase the gears in sequence when using Suitable for 14650, 17490, 18650, 21700, 26650, 32650, etc. Cylindrical lithium batteries, nickel metal hydride batteries, etc., can be spot welded firmly. Supports 0.1-0.3mm nickel sheet spot welding Bilateral outlet is convenient for spot welding. The product is marked and it is not easy to connect incorrectly 8 square meter spot welding pen, 10AWG wire, aluminum oxide copper spot welding needle, ensuring excessive current capability and durability, greatly improving spot welding efficiency Product name: K99 Spot Welder Working voltage: 6.5V-16V Working current: Less than 20ma Standby power consumption: Less than 0.5ma Recommended operating temperature: -10-60℃ Voltage: 12V Welding current: 1700A MAX Welding nickel sheet thickness: 0.1-0.3mm (related to battery discharge energy) Capacity 20AH-80AH, battery does not exceed 45AH or 4-5 strings of super capacitors Prohibited: It is prohibited to use switching power supplies, , chargers, water bottles, and power for power supply. Colour:As Shown Material:PCB Package Contents: 1 Set x Diy Complete Set Of Loose Parts For Spot Welder 1 x Casing 1 x Chinese and English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.