A. Product Principle There are high and low voltage and current power of different sizes in the grids .Practice has proved that not only the high voltage has no benefits to electrical appliances ,but the main reason of tariff increase and the result of electrical easy to damage. Products using digital on-advanced technology, control voltage, current and surge uniformly, to provide the best electrical efficiency of using electricity. Ensure that the use of electrical appliances in the normal circumstances, to achieve purpose of energy saving, environmental protection, and life extending. B. Product Features a) Just try and has obvious effect. b) Single electrical appliances can be used. c) It's plugged in without installation. d) Modeling new, refined and aesthetic, magnesium-alloy casing C. Scope Suitable for refrigerators (counter), drinks cabinets, electric water heaters, heating, etc. single load. D. Installation method Insert the electric plug into the socket surface of energy saver, and then insert the plug of energy saver into the socket of 220V. E. Technical parameters a) Voltage: 220V b) Power: 3000W c) Frequency: 50 Hz d) Energy saving efficiency: %10-%50