Ember Mug² Copper Edition is a brilliant new take on Ember’s classic smart mug, and is guaranteed to make every morning shine. Ember allows you to set your preferred drinking temperature (120°F – 145°F), so you can enjoy your hot drink—just the way you like it— from the first sip to the last drop. Ember is not a simple mug warmer. Ember Mug²’s built-in battery maintains your chosen drinking temperature for up to 80 minutes with the built-in battery, or all day with the included charging coaster.