Features: 1) Permit voltage tolerance: ±20% 2) Easy operation, convenient adjustment 3) Quick charging, energy saving 4) Very small and light, easy to carry Technical data:MODELSW1600SW2500RATED INPUT VOLTAGE (V)1 PHASE 220V, 50/601 PHASE 220V, 50/60WELDING MATERIALMILD STEEL, STAINLESS STEEL, ALUMINUM & BRASSWELDING RATE10-20 PIECES/MINUTE, DEPENDING ON BOLT DIA.WELDING TIME1ms 3msCAPACITOR CAPACITY66000uF99000uFWELDING ENERGY1600Ws2500WsWELDING SCOPEM3-M8M3-M10CHARGING VOLTAGESTEPLESS REGULATION 10 200VPOWER MODECAPACITOR ENERGY STORAGEWEIGHT (kg)1213.5EXTERNAL DIMENSION (mm) (L x W x H)355 x 355 X 155355 x 355 X 155Inverter Stud Welding Machine (welding machine, stud welding machine)