This is a very creative product that would make the perfect gift for any one. It looks like an ordinary mug with nothing special about it except that it changes colors depending on the temperature of the liquids in it. It uses heat sensitive materials so that the mug will change colors when introduced to heat from liquids. The black color is cold, and the white stands for the hot. The lettering on the mug will also change from cold to hot. This is a great way to know if your coffee is hot or if you should go and refill your cup. No more drinking lukewarm coffee with this mug. This gizmo will let you know when it is time for another coffee break!
More info from the manufacturer
(Please note prices are subject to change and the listed price is correct to the best of our knowledge at the time of posting)