Review on ☕️ Coffee Mug Warmer - Electric Desktop Beverage Warmer for Office and Home Use - 110V, Automatic Shut Off Function - Best Gift for Coffee Lovers - Ideal for Tea, Water, Cocoa, Milk - Enhanced SEO, Black Color by Roberta Johnson

I usually spend hours brining my warm beverages while sitting at my desk. This item does the job except it is way too hot. Even on the lowest settings. So I have to keep turning it on and off. And yes, you need a flat-bottomed mug. My favorite mug has a slightly concave bottom and doesn't work well, it takes a long time to heat up. I had to go through our closet looking for a really flat butt. It again uses easy-to-use touch buttons.