Specification:  Maximum welding thickness: 0.3mm;  Input voltage: 8.4V;  Size: 115 x 136 x 65mm(Length x width x height).     Instructions for use:  1: The device voltage is lower than 6.5v to charge, please turn off when charging, the charging green light is always on, the full light is off.  2: This product is suitable for spot welding of 0.2mm pure nickel, 0.3mm nickel plating, non-transferable nickel, and no spot welding of copper, aluminum and other low internal resistance metals.  3: Pulse time setting, the default is 5MS, 0.1 nickel plating setting 2~3MS, 0.15 nickel plating 4~6MS, 0.2 nickel plating 6~9MS, 0.3 nickel plating 10~13MS, when the device voltage is lower, the pulse time needs to be adjusted Large, maximum 15MS.  4: Automatic spot welding, when the soldering needle touches the silver sheet for 0.8 seconds, the spot welding is automatically triggered.     Package included:  1 x spot welding machine;  1 x set of accessories.