Parameters:Working Voltage: AC 220VMaximum Power: 4000W (connected resistive load)Voltage Regulation: Begin from 10V, 10V-220VDimensions: 85 X 58 X 35 MMProtection: Anti-spike, Surge, RC absorption (EOC)How to use:Adjustable Power Supply Board; connect this device with lamp or home appliance or electric circuit, then rotate the knob for dimming, speed, voltage, temperature control.Some Application:Electric furnace, water heater, lamps, small motor, electric iron etc.Package Includes:1x Voltage Regulator