Features: Great as a voltage regulator 220V for grinders, drills, heaters, kettles and much more, for flexible power and speeds control in the home and in the workshop. With knob precise voltage can be adjusted from 0-220V without delay or jump, perfect as a dimmer, temperature or speed controllers. 4000W maximums power, with builted in heat sink, overheats protections & galvanized steel housing. Space saving design, freestanding or wall mountable. Includes plugs & cable for immediate use. The device with socket is ready to use. Grounding required, not suitable for LED lamp, microwave or pumps. Specifications: Component: Galvanized iron shell Input ranges: AC220V Current: 9A (maximums current of 18A) Output voltage: AC30-220V Restricted power: 4000W Wire length: about 90cm/35.43inch Size: about 11.5x10x6.1cm/4.53x3.94x2.4inch Package Includes: 1Pc Voltage Regulator note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.