dealsusb powered coffee warmer for $5.91

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I bought a similar USB coffee warmer from Woot a couple years ago for about the same price. It was worthless. It didn't accommodate anything larger than a standard sized mug. It didn't keep my coffee warm, either. It probably extended the time it took for my coffee to get cold by 5-10 minutes and it didn't get quite as cold as without the "warmer". This one may be a better product but it's unlikely. I don't think the USB port really gives it enough power to work properly.

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@chipgreen: I agree totally. I have one too and it is worthless. What a waste. Doesn't even get room temp.

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@chipgreen: how big of a cup are you using?