1. 99 gear power adjustment, digital tube real-time gear display, gears 0-99, 1st gear is the lowest, 99th gear is the highest, increase the gears in turn when using2. Using 5 MOS tubes: The control board of the spot welding machine adopts 5 MOS tubes. After 5 parallel connection, the theoretical maximum current can reach about 1700A.3. 8 square spot welding pen, 10AWG wire, alumina copper spot welding needle, to over-current capability and durability, greatly improve spot welding efficiency4. Bilateral outlet, easy to spot welding, the product is marked, it is not easy to connect wrongly5. Suitable for 14650, 17490, 18650, 21700, 26650, 32650 and other cylindrical lithium batteries, nickel-hydrogen batteries, etc., can be spot welded firmly, support 0.1-0.3mm nickel sheet spot weldingProduct name: 99 gear spot welding machineWorking voltage: 6.5V-16VWorking current: Less than 20maStandby power consumption: Less than 0.5maRecommended use temperature: -10-60Voltage: 12VWelding current: 1700A MAXThickness of welded nickel sheet: 0.1-0.3mm (related to battery discharge energy)Capacity: 20AH-80AH (new battery no more than 45AH or: 4-5 strings of super capacitors): It is forbidden to use switching power supplies, , chargers, water batteries, and power to supply power Product size: 90x60mmColour:PurpleMaterial:PCB+MetalPackage Contents:1 x Control panel2 x input line2 x spot welding pen2 x heat shrink sleeve1 x screw pack1 x Nickel sheet1 x Chinese and English manualOnly 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.