So there's only one place where things get hot: a removable pad that sticks to the palms. For me personally, this is the least useful place, so I put them on backwards to warm my palms. They only work when plugged into the mains and the cable that comes with it is quite short. That's fine for a laptop, but if you need them for an office where your computer is behind a monitor or under a desk, you're out of luck without an extension cord.
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