Instructions for use of automatic spot welding control board:  1. Power requirements: In 12V mode, voltage input is 7-15V (12V recommended), in 5.6V capacitor mode, voltage supports 3.7-6V.  (recommended 5.6V), current requirements: can output actual current 120-360A.  2. Button function: switch between 1 power level-2 power level-3 power level-4 power level after long press for 3 seconds.  3. The red light is always on (automatic spot welding with 1 power level, press for about 1 second to spot welding)  Red light is flashing (automatic spot welding with 2 power levels, pressing for about 1 second spot welding)  The blue light is always on (automatic spot welding with 3 power levels, pressing for about 1 second spot welding)  Blue light flashes (automatic spot welding with 4 levels of power, pressing for about 1 second spot welding  Green light is always on (waiting for spot welding).  4. Buzzer prompt, output once for each spot welding, buzzer buzzes once.  5. The MOS is damaged, the indicator light flashes red and green alternately, and the buzzer sounds piercing (at this time, note that the spot welding pen cannot be spot welded, and the two needles cannot touch each other).     Package includes:  1 x spot welding control board with pen