Features: The controller is controlled by a single chip microcomputer, and the output pulse is accurate to ensure the welding quality. Using automatic touch welding mode, while retaining the manual trigger interface, you can choose according to your own use. Wide selection of welding power supply: lithium battery power supply or 12V car battery. lithium battery power supply or 12V car battery. The controller is controlled by a single chip microcomputer, and the output pulse is accurate to ensure the welding quality.With LCD display screen, can display welding parameters. Specification: Material: Metal Input line length: app.20cm7.87in Length of welding pen: app.30cm11.81in Color: Red+Blue+Black Battery: 18650 lithium battery(not included) Package Weight:20x15x3M Package size:210g Noted:There are 99 gears in total. Do not exceed 50 gears, otherwise the possibility of burning will not be ruled out! Instructions for use: 1.Power connection The controller comes with a 20cm long 10AWG input wire. One end has been crimped with a U-shaped terminal, and the other end has not been processed. Connect the crimped U-shaped terminal to the control power input terminal, and the other end is processed according to its own power supply. Do not connect the negative electrode wrong. 2.Switch on and off There is a power switch under the control board. After pressing, wait for 3 seconds. After the buzzer drops, the LCD lights up and the boot is complete. Press the power switch again to shut down. 3.Screen description and parameter adjustment. 4.Welding Keep the welding pin clean. If the welding pin is polished into a round head, the welding effect can be improved. There are manual and automatic methods. Package Included: 1Pc x Controller 2Pcs x Welding pen 2Pcs x Power input line (Red and Blue) 1 Pair x U-shaped cold-pressed terminal