On Off Temperature Controlled Mug Heat Sensitive Mug

cool little novelty mug. what i didnt think to look at was the size, it holds 8oz, which is a serving size but also much smaller than any coffee mug i own, requiring multiple refills in the morning.

It is a cute novelty but the cuteness wears off quickly, and it becomes just another coffee cup. My youngest two grandsons like to show it to those who have never seen it before. They let it change, then change back. Then they are off doing something else.

If you have a friend or family member with a latent sense of humor and you don't speak to unless they have their morning caffeine - this is the product for you. Nice weight and good handle, follow the instructions to hand wash to preserve the paint and enjoy!

OK, so it's just heat sensitive paint. The ON and OFF words don't overlap so you can't say the 'ON' changes to 'OFF'. But it still does the job. The cup is a little small (not a full serving of coffee).

Ok. As per expected. However the colour changing really depends on how hot the water on the mug.I like.

Its great to see it change of color in front of your eyes, and turn back when is cool. Love it.

Good gimmick for Christmas, Birthdays etc. - a bit small for actual use perhaps

very good concept and I like it. But the color changing pigments are not changing well. Just after a few times I saw how the color isnt solid white or black. in a little more uses, the words 'on' and 'off' are both visible when the mug is either hot or cold.i wouldnt recommend it to others...