The Ember Mug 2 is a smart, self-heating coffee mug designed to maintain your beverage at the desired temperature for up to 1.5 hours for the 10 oz size and 80 minutes for the 14 oz size. It features a built-in battery and Bluetooth connectivity, allowing users to control the temperature through the Ember app. The mug is safe to hand wash and can be submerged up to 1 meter in water. It also includes an auto-sleep function that turns off after a period of inactivity or when the mug is empty. Works with iOS and Android.