Features Adjustable Uses - From 1 to 199, the mini spot welder supports 199 levels of adjustment to better satisfy your different needs and improve efficiency. Wide Use - Allows wide use on different batteries such as 12V 14Ah-100Ah battery, 18650 battery, Farad capacity and more. High Safety The whole welding process is very safe, hobbyists and professionals can use this welding with great safety and ease. Digital Display: Equipped with a digital tube, this spot welder has a clear display to show the current working status and simplify the operation. Simple Transportation - Designed to have compact size and light weight, the spot welding machine is very convenient to carry outside. Specification: Item Type: Spot Welder Relay voltage and current: 9V 500A Applicable batteries: 1. Batteries: You can use a 12V 14Ah-100Ah battery. And a 14AH battery must be fully charged to be soldered safely). 2. Farad Capacity: Super Farad capacitor 2.7V 3000F can be soldered by charging three super Farad capacitors in series at 8V, the maximum number of Farad capacitors in series does not exceed 4pieces. 3. Car Jump Starter Battery The output interface to start the battery must be EC5 and the peak current should be less than 1500A. D. Aircraft Model Battery:Please use XT60 interface, 3S-4S model 3000mAh aircraft battery, discharge rate below 60℃. Package list: 12 x nuts. 8 x screws. 8 x Stud 2 x Acrylic Panel 6 x Washers 2 x insulating sheath. 1 x Tin Strip 2 x welding pen. 1 x Motherboard 1 x Button 1 x relay. Note: 1. Please use a battery with 7-17V DC to ensure the power supply of spot welding machine 200A to 1500A, otherwise it may damage the motherboard. 2. Do not use alligator clips to connect the spot welding machine. 3. The length of the power cord is about 25cm. Extending the power cord will weaken the spot welding ability and even make spot welding impossible. Package List 12 x Nut 8 x Screw 8 x Stud 2 x Acrylic Board 6 x Washer 2 x Insulating Sheath 1 x Tin Strip 2 x Welding Pen 1 x Motherboard 1 x Knob 1 x Relay