They do what they're supposed to do. But even with a product this simple, there are things that can be poorly designed. Unfortunately, this adapter does not offer enough grip from the US side. It works more or less well with US cord plugs, but if you try to use it with heavy devices that don't have a cord (wall-outlet devices), you'll quickly find that the device has a constant tendency to fall off. from this adapter under its own weight. This is very annoying. Such adapters should exert significantly more friction on the US plug.
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