Designed for home or office, the Ember Mug 2 does more than simply keep your coffee hot. The smart Ember Copper Mug 2 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 80 minutes with the Ember Mug 2, oz so your hot beverage stays perfect. Ember Mug 2 is safe to hand wash and submersible up to 1 meter in water. Smart LEDIndicates when beverage has reached its perfect temperature and more. Built-In Battery14 oz maintains temperature for up to 80 minutes. All day when placed on charging coaster. Auto SleepIntelligently senses when to turn on and off. Temperature Range120 to 145- degree Fahrenheit (50 to 62.5-degree Celsius). Select your temperature with the Ember app. Precision in the Palm of your HandsEmber is a connected device. Use the Ember app to set your temperature, customize presets for your favorite drinks, receive notifications when your desired temperature is reached, and personalize your mug and more. | Ember Mug 2 with Smart LED, Built-In-Battery and Auto Sleep (Copper).