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- Having gone through part of the reviews here, I guess some users might have misunderstood the application of this converter. If you want to use your ELECTRONIC devices operated with a rechargeable battery (such as your iPhone, cell phone, ipod, ipad, laptop, digital camera) in a foreign country, you don't need to bother, because nearly all these electronic products are designed today to be completed with a battery charger suitable for a voltage range from 100V to 240V; in other words, people travel around with these electronic items, so these items should work properly at any voltage anywhere in the world. Whatever you have and wish to use in a foreign country, just carefully check the marking on the battery charger about the voltage rating ... if the voltage rating is printed or embossed as "100-240V", then don't worry, you can use your devices without such a converter. Another thing you should check is if you will need a plug adapter for that country, because there are quite many types of power plugs in the world. For example, if your laptop's battery charger has a U.S. type power plug, you cannot plug it directly into a wall socket in Australia or in the U.K., since the pins and the slots do not match. I also brought with me two laptop's, a cell phone and an SRL digital camera from China (at 220/240V) and have been using them here in the U.S. (at 110V) for almost half a year ... everything is okay as perfectly as they worked in China, because the battery chargers can work at any voltage from 100V to 240V. In this case, I only bought a plug adapter, so that the 3-flat-pins plugs (Chinese standard plug) of these battery chargers could be inserted to the wall socket here in the U.S. However, if you want to use an ELECTRICAL item operated under alternating current (like a hair dryer, steam iron), you will need such a converter, so that your electrical item for 110V can be used at foreign voltage 220/240V. If you don't, your electrical item will get burned from voltage break-down. Some products sold in the U.S. are completed with a rechargeable battery (electrical toothbrushes, for example), but the voltage rating of the battery charger is subject to 110V, meaning that the battery can be charged at 110V only. So if you need to use such an electrical item outside the U.S. at 220/240V, such a converter will be necessary. I ordered this converter for my parents who are going to travel in China, as they'd like to bring a water flosser with them and that is absolutely an electrical item. I received this in a good condition, but couldn't find a better manual than the brief instruction on the box. The quality should be okay as it has adequate weight. Hope my parents would say yes to its quality after they use it. Update on 04-28-11: According to my parents, this converter does not work with a water flosser in China. It is too weak, and there is no water flush generated from the water flosser even at the 'HIGH' position of the converter. It was a waste of money. I would not recommend this product. Something you should know: 1). This listing is misguiding people to buy an unnecessary accessary for their cell phone, iPod and camera ("Ideal for Hair dryers, iPods, Phones, Camera" ... the exact wording from the listing); 2). By using some vague description, this listing makes people think that the converter can be used with items working at 50W-1875W, but in fact it is mostly subject to <50W; 3). When people realize this converter does not work during the trip, some of them especially those on a longer journey for 30+ days will not have the chance to return the converter to the seller after they are back to home.