Designed for home or office, Ember Mug2 does more than simply keep your coffee hot. The temperature control smart mug allows you to set your preferred drinking temperature (120ºF - 145ºF), 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 1.5 hours, or all day with the included charging coaster.