Overview: The input is connected with AC 220V, output is connected to the electric stove wire or motor appliances, then rotate the knob for speed, voltage, temperature control.   Specifications: Working Voltage: AC 220V Maximum Power: 4000W (connected resistive load) Voltage Regulation:AC 0-220V,Start from AC 10V Dimensions: 89(L) x 59(W) x38(H)MM Protection: Anti-spike, Surge, RC absorption (EOC) Net weight:147g   Applications: Control of 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; Using the resistive load as far as possible; Reduce inductive and capacitive load power greatly. ( it is best to leave more than half of them)