1, using a programmable controller, the program flexible, high precision, high reliability, multi-function, fast response. The direct control of the inverter. According to the set pressure of water users to track changes at any time to adjust the speed and number of pump units pump motor that runs on the device setting parameters to achieve the purpose of energy conservation. 2, large units are equipped with a surge tank pump regulator or regulators, in a small amount of water to a certain value, the main pump may stop functioning, reduce mechanical wear of the pump motor and save energy. 3, the pump are soft start, extend equipment life, eliminating the starting current impact on power. 4, according to changes in water circulation pump frequency operation, the first start of the first stop, the pump balanced work. When a pump is running six hours or twenty-four hours automatically switch to another. 5, the most important feature of this device is dual voltage control, the fire of life can share a device for users to save and invest. And in one machine, greatly improving efficiency. 6, the device is compact, small footprint, quick installation, investment, stable, non-polluting. Water supply means during operation of the pump, there is a constant speed and variable speed in two ways, the requirements of the user can press the water flow adjustment. Constant speed operation, the general use of throttle, the disadvantage of this approach is inefficient, high energy consumption. Changing the speed run the pump speed during operation, thereby regulating the output flow to adapt to changes in water and can guarantee a constant pressure in the pipe, the pump is always working in conditions of high efficiency. When the water was reduced, reducing the speed to run the pump. Due to the pump shaft power is proportional to the cube of the speed. When the speed decreases, the shaft power dropped dramatically, so adjust the flow speed sufficient to improve mechanical efficiency and reduce energy consumption the most economical and reasonable.