Features: brand new and high quality Premium upgrade Portable Spot Welder Set adopts 25V low internal resistance Sanyo high frequency capacitors to ensure the power supply more stable. Premium Spot Welder Set is made of high quality material which can use for a long time.Design with upper and lower bold and tin MOS ensures the current stronger and the internal resistance smaller . Please extend the wire by about 1 meter with 2.5² or 4² wire, then it can reduce the damage of the power tube. Suggested 3.5-5.5ah 45C 3S aeromodel battery pack ;20-45ah battery with small internal resistance. Package Include: 1set x Portable Spot Welder Set. Specifications: Material: printed circuit board Working voltage: 6.5-16V Recommended working temperature: -10℃ to 60℃ Voltage: 12V Welding current: 1700A Max Welding thickness: 0.1-0.3mm Size: approx. 89x54mm/3.50x2.13in Package Includes: 1 x Spots Welding Machine note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you.