Ideal for espresso-based drinks such as cappuccinos, cortados, and flat whites, the new Ember Cup 6 oz offers a premium coffee experience that does more than keep your coffee hot. Our smart mug allows you to set your preferred drinking temperature, so you can enjoy your expertly crafted hot drink ?just the way you like it? from the first sip to the last drop. Ember Cup?s built-in battery maintains your precise drinking temperature for up to 1.5 hours or all day with the included charging coaster. Smart LED. Built in battery. Autosleep. Temperature range 120?F - 145?F