Love your baked goods but trying to watch your waistline? It's just one of the joys of a desk job. These mug warmers are 100% calorie-free, so you can enjoy the look of a delicious donut or cupcake without the guilt! We know, that's not much consolation, but you have to admit, when you're drinking your calorie-free black coffee or tea, it's better when it's steaming hot. So get yourself one of these great mug warmers. Just plug one into a USB port, and your beverage will stay as hot as it was when you first poured it. They're the perfect combination of form and function!