❝ Designed for home or office, the new Ember Mug does more than simply keep your coffee hot. Our smart mug allows you to set an exact drinking temperature, so your coffee is never too hot, or too cold. Depending on the size, your beverage will maintain its chosen warmth for 80 to 90 minutes.
I can think of several fixated folks I worked with over the years who probably own one of these. After a number of years as retiree, I pretty much know just how long to nuke my coffee to bring it back to proper temperature. No batteries needed for any of my favorite coffee mugs. Just walk to the kitchen and back.