The World's First Temperature Control Mug Designed for home or office, the new Ember Mug² 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. Ember then maintains your chosen temperature for up to 1.5 hours with the Ember Mug² 10 oz and up to 80 minutes with the Ember Mug² 14 oz - so your hot beverage stays perfect. Ember Mug² is safe to hand wash and submersible up to 1 meter in water. Smart LED Indicates when beverage has reached its perfect temperature and more. Built-In Battery 10 oz - 1.5 hours All day when placed on charging coaster. Auto Sleep Intelligently senses when to turn on and off. Temperature Range 120°F - 145°F (50°C - 62.5 °C). Select your temperature with the Ember app.