Product details Designed for home or office, the Ember Mug 2 and its companion smartphone app allow you to set your precise drinking temperature for hot beverages, track caffeine consumption, save presets for your favorite drinks, customize the LED color, and more. Ember maintains your chosen temperature for up to 80 minutes, so your warm beverage stays perfect from the first sip to the last drop. Longer Lasting Battery: Extended battery life on your temperature control mug keeps your drink perfectly hot for up to 80 minutes on a full charge or all day on the newly redesigned charging coaster. Choose the exact temperature you prefer (between 120°F - 145°F) App Controlled: Ember smart mug allows you to control with your smartphone. Pair with the Ember app to set your temperature, customize presets, receive notifications and more Use Without App: Ember Mug is functional without connection to the app and will remember last used temperature. Out of the box, the Ember Mug is set to 135°F Auto Sleep: Ember heated mug intelligently senses when to turn on and off. The mug enters sleep mode when empty or after 2 hours of inactivity. Ember wakes up when it senses movement or liquid