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Features: 1. Large capacity, high safety, cannot explode and release toxic gases, humidity, dust, pollution is not sensitive, energy saving, low noise, flexible design and so on. 2. The main function of STU Series AC power transformers is voltage conversion, it can convert 220V into 110V, or 110V into 220V and USB output in order to solve the different voltage between countries and regions. 3. Universal socket -110v / 120v to 220v / 240v input / output socket widely suitable for various of electrical plug 4. 6 safety protection - overload protection, thermal protection, short circuit protection, efficient intelligence, precision voltage, quality certification 5. It is recommended that multiply x2 the wattage of your item and get a transformer bigger than that. Because some devices like hair dryer, coffee machine, cooking machine, vacuum cleaner, soymilk machine etc have 1.5-3 times of its rated power , and some devices like refrigerators, air conditioners, electric drills, Microwaves etc even have 3-7 times of instantaneous current. Note: Please determine the electrical power first and then confirm whether it is a sensory or a resistive appliance. Or it may damage the converter. Most of the review problem is the fuse and the reason is that customers have chosen the wrong transformer converter.If you don't know how to choose, please contact the seller.