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The "thermal" portion does work, but alas the image on my cup wasn't the same one as the advertisement, I wanted the battery version so that I can see at a glance how much coffee was in the mug, instead I ended up with some footprints and words that were akin to something out of "Harry Potter's wizardly world".
Coffee is a huge thing in my house, so of course we have tons of coffee cups. I have alwas enjoyed the coloring changing mugs as they always make my morning a litle bit better. I absoutely love this mug because its color changing, and not just one color, but many colors. Starting from the bottom the colors are red, orange, yellow, green, and then turquoise. This mug is really cool because when the liquid in the cup is cool the outline of the battery is white and as hot liquid is poured in, the battery level goes up! It's really neat and still gets me no matter how many times I use it. I also find this handy because if I get too busy doing anything I can alays check my mug to see how cool or cold my coffee is. Now the important part of this mug is to make sure you NEVER microwave or put this cup in the dishwashr as it will not work the same. I recieved this item at a discounted price for my honest and unbaised review.