... arc welder, battery charger, vehicle booster in one unit with micro-processor control and digital display. Main feature:- Latest electronic parts ... unit.- Realize spot weld, washer weld, pulling weld, shrinking, electri weld, melting weld for copper wires and steel wires, battery charging and ... control welding time adjustable at 0.1s-9.9s and charging time at 1-99 hours.- Copper bolts output connector ...