Lack of Bad Design. There should be a plastic pin for the top input of the output for stability. The screw attachment is not universal for my outlet. Even if it were, although I have good hands and some don't. As such, it's not literally "plug and play", but instead requires tools that some people may not have (flat head and Phillips). If you plug it into an outlet without a screw mount, it will be unstable and wobble at the top. You don't want to unplug the entire device from the wall if you're just trying to remove one plug. I bought another brand (Addtam) which was black, identical to this one but has the correct pin for stability.
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