The adjustable voltage range can be truly and adjustable from 10V to 220V, making it more suitable for appliances needed low voltage to drive the heating wire. Dual Capacitance Design: Adopt amperometric capacitance + metal film capacitance to surge and voltage , more efficient and to use. Wide Application: Use to adjust the speed, brightness, voltage, temperature of electronic devices, such as electric furnace, water heater, , small motor, etc. Durable Performance: Using high shell case, which is made of 1.5mm thickness aluminum and stainless steel, safe and convenient. Easy to use: Easily control voltage, speed, temperature and more via the adjustable knob. This voltage regulator is a good solution to the over-current problem caused by the small resistance while electric wire core is in cooling. Using the two-way high-power thyristor, the maximum current can reach 20A, easily adjust the output voltage at 0-220V. Widely used for appliances with power less than 4000W, such as electric furnace, water heater, , small motor, and more. Input Voltage: AC 220V Voltage Regulation: AC 10-220V Power: Max. 4000W Efficiency: 90% Size: . 85 x 55 x 38mm / 3.3 x 2.2 x 1.5in Note: The loaded power cannot the specified maximum power, otherwise it will burn the module and electrical appliance. Color: silver+black Material: Metal+ABS Package Contents: 1 x Regulator Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.