OK I think I have a very average coffee mug that doesn't taper and only part of the bottom touches the surface it sits on (concave). I don't have a lid on my ceramic mug, so some of the heat is definitely coming from the top. This product barely keeps my coffee warm. This is my favorite mug that is 25 years old now and I'm not interested in looking for a flat bottomed mug but I still don't think it would be a regular coffee cup or mug. It extends to the bottom of the cup, the last 1/2 inch or 1 inch of coffee actually heats up nicely depending on how long I let it sit on the heating pad. In addition, it cannot beat regular coffee mugs in terms of heat dissipation. I didn't buy it to drink warm coffee. The touchpad is a nice feature. You need a few ounces of WEIGHT to activate it. As long as you have regular ceramic mugs, it should activate normally, even if it's almost empty. 2 stars.
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