Voltage Converter Company is a leader among voltage converter manufacturer. Our main focus is creating the highest quality products. Voltage Converter Company is an United States voltage converter maker located in Los Angeles. Our company concentrates on voltage converter design and voltage converter manufacture. The main products are 110v to 220v voltage converter, 220v to 110v voltage converter, step up voltage converter, step down voltage converter and so on.
You need that box to convert the electricity from AC to AC or vice versa. The converter plug usually has a transformer box with an adapter in one piece. If not then you would have to buy an adapter to plug into the wall then plug your converter into the adapter then plug-in your US bought device. The reason why you would buy this is for your devices that don't have a box (i.e. your straightener). If you simply use an adapter with your American bought straightener then it'll blow up or do something else unpleasant.
It all depends on the wattage of unit- it is always best to try to use a converter that is rated 3 times more wattage that the 220 unit. For example: if units wattage is 500 get a 1500 or 2000 watt converter and so forth. That's not always possible. But I would at least try to get double. I use converters all the time for gas coffee roasters that have wattage up to 1000 or more. I use a 3000 watt converter for those. There comes a point where the converter costs more than a dedicated 220v outlet. At that point the outlet could make more sense.