Meet Ember. Ember is a design-led temperature control brand. The Ember Ceramic Mug is beautifully designed to be used in your home or at your desk, and keeps your beverages at the perfect temperature from the first sip to the last drop. Taste Temperature. The Ember Ceramic Mug connects to the Ember app, allowing you to set your perfect temperature and notify you when it’s reached, personalize your LED color and create temperature presets for your favorite drinks. A fully charged Ember Ceramic Mug will keep your drink at your preferred temperature for about an hour; use the included charging coaster to make it last all day.