1Temperature protection: Heatsink temperature higher than 65 C, enter protection. under 65 C back to normal. 2Undervoltage protection: Input voltage is less than 20V, enter protection. Input voltage up to 24V back to normal. 3Power tube broken/short circuit, display MOS-XX. 4Copper pipe and water pipe connections, the need to seal to prevent water leakage. 5Please installed the copper coil and water pump, then connect the power supply.(can not empty load)Features: 1. Temperature protection: Heatsink temperature higher than 65 C, enter protection. under 65 C back to normal. 2. Undervoltage protection: Input voltage is less than 20V, enter protection. Input voltage up to 24V back to normal. 3. Power tube broken/short circuit, display MOS-XX. 4. Only iron can be heated directly. Other metal materials need graphite crucible. 5. Copper pipe and water pipe connections, the need to seal to prevent water leakage. 6. Please installed the copper coil and water pump, then connect the power supply.(can not empty load) Specification: Size: about 198*100*95mm/7.8*3.94*3.74in Copper tube coil: Approx. 50mm / 2in Input voltage: DC 24V-70V Input current: 48A (Max), Power: 2000W Short Circuit/Overload: Input current is greater than 40A, voltage greater than 55V, enter protection. Package List: 1 * Induction Heating Board 1 * Spiral Copper Pipe 1 * Water Pipe 1 * Mini Water Pump 1 * Adapter 1 * US Plug 1 * Screw Package1 * Telescopic Belt Note:1. This Induction Heater need 2000W power supply to Heating material.(Recommend 48-53V power supply2. Only iron can be heated directly. Other metal materials need graphite crucible.3.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.