1.Lose electrical power to protect ---Change by UPS battery direct current power alternating current continue and supply power immediately when losing electrical power in a flash. 2.The voltage is protected at last ---One city electric voltage too high or UPS build voltage stabilizer (AVR ) make proper adjustment when passing low, make voltage , city of electricity keep in range that can use, if voltage pass low or pass superb to pass but scope of application, UPS change battery direct current power alternating current continue and supply power , in order to protect user's equipment. 3.The wave form is dealt with distortedly ---One, because the electricity is conveyed to the customer end via losing the distribution line, the use of different machinery equipment, cause city electric voltage wave form distorted , because wave form distorted to produce in harmony wave interfere equipment and can make power system voltage transformer temperature rise often, generally it require rate it is distorted <5%,last rate not distorted UPS not general <3%. 4.Frequency is steady ---The electric frequency of one city is divided into 50Hz/60Hz two kinds, the so-called frequency is every second, 50Hz is 50 weeks per second time, frequency of the electricity of Taiwan is 60Hz, the mainland is 50Hz. The generator is caused the change of the rotational speed to make the electric frequency changed out float indefinitly by the unexpected change of the power consumption of customer end while operating, the electricity that UPS changes can offer steady frequency . 5.The voltage is steady ---One city electric voltage apt to transport electricity influence , circuit of quality, from transformer substation close user voltage high about 130~120V, far user voltage low to invite 1000V from transformer substation, it too high voltage has to be or too low to can use households of equipment contract life-span, will burn the equipment when being serious , use online UPS to offer the steady voltage power , voltage change less than 2V, can lengthen the life-span of the equipment and protect the equipment . 6.Suppress the horizontal model's noise ---A horizontal mould of noises are produced between battle line and neutral line. 7.Suppress the noise of the mould altogether ---Cost altogether mould noise produce between battle line / neutral line and ground wire. 8.Dash for ward waves to protect ---General UPS will be installed additional and dashed for ward the wave absorber or the point discharge to design and absorb and dash for ward waves, in order to protect user's equipment. 9.Respond and protect instantaneously ---The electricity leads to the fact sometimes while interfering the voltage projects or sunk or pressed and lowered and used online UPS to offer the steady voltage in the twinkling of an eye in the city, make the voltage change less than 2V, can lengthen the life-span of the equipment and protect the equipment . 10.Control the power ---Cooperate with intelligent communication interface of UPS and control software can is it lose electrical power time and number of times is it reach control of power to come to note down city electric voltage frequency, and can arrange for the time table of UPS time switch to economize the energy .