1) The voltage stabilizer stabilizes the voltage to prevent the unstable voltage, stabilize and balance the electricity, and prolong the lifespan of the electric appliances. 2) The product installs the device against protruding wave additionally, take precaution to the protruding wave of the electricity, protect electric appliances. 3) The electron controls the electric capacity, balance the electricity, omni-directionally enhance the power of using electric products, avoid the waste of the invalid electricity. 4) The device does not consume the electricity itself. The electricity charge burden will not increase even if it is used all day long. 5) It is suitable for air conditioning, washing machine, refrigerator, electric fan, TV, water pomp, stereo, fluorescent lamp, etc., also suit for common family, company, firm, store, and small-scale factory. 6) Suitable voltage: 90V-240V/50Hz-60Hz. Serial Products of Worm Driving Device Adopt the modern scientific and technological means to create the ultra-low frequency electromagnetic wave and the ultrasonic infrared ray, make the pests such as cockroach, mouse, mosquito, etc. feeling discomfotable and flee far away. This product can drive the cockroach, mouse, ant, spider, flea, moth, etc. It is harmless to human and pets. And it is a environment friendly product without any contamination. It can be extensively used among families, factories, warehouses, offices, hotels, stores, hospitals, etc. Using continuously so it can effect best 30 days later. The maximum area of using is 400 square metres.