Ember Temperature Control Smart Mug 2, 10 Oz, App-Controlled Heated Coffee Mug Drink your coffee and tea at the perfect temp. Receive a notification that your coffee is perfectly warm. Track your caffeine consumption via a connection to your health app. Smart With or Without App: Pair this temperature control mug with the Ember app to set the temperature, customize presets and more; Our self-heating coffee mug is also functional without the app and remembers your last-used temperature (135°F out of box). Auto Sleep: Our heated coffee 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.