Maximum Power: 4000W (connected resistive load) Voltage Regulation:AC 0-220V,Start from AC 10V Dimensions: 91 x 59 x 34MM Protection: Anti-spike, Surge, RC absorption (EOC) How to use: The input (POWER) is connected with AC 220V, output (MOTOR) is connected to the electric stove wire or motor appliances, then rotate the knob for speed, voltage, temperature control. Some Application: Electric furnace, water heater, lamps, small motor, electric iron etc. Attention: Load does not exceed the maximum power, otherwise it will burn module and electrical appliances; use the resistive load as far as possible; reduce inductive and capacitive load power greatly.( it is best to leave more than half of them)