Sowte Electric Power Saver, which is the latesttechnology, it can be widely used in hotels, shoppingmalls, factories, hospitals, parking lot, restaurant, schools,petrol filling station, it has remarkable effect onpower saving and electricity bill saving. Sowte Electric has unqiue technology and patent to develop power saving device, it is combination of Japanese and Chinese technology. It can save around 30% electricity bills, greatly save power on motor, luminaire, street light, appliances, so it has bright future. Its functions are as follows: 1.Reasonably adjust operating voltage of appliances, make appliances work in optimal conditions 2.Restrain harmonic current 3.Reduce inrush current 4.Can reduce the energy loss in the power supply line (especially the consumption of copper ), increase system’s power factor, save energy by compensating system’s reactive power. 5.Level switching: can change the level of power saver according to different loop parameter, normally there are 3 levels, also can increase or decrease levels, the higher level, the better power saving effect. But it is optimal to get equilibrium of best working efficiency and power saving effect, to select proper power saving level according to its circumstances.