The Ember Mug uses electricity from it’s dual lithium-ion batteries to heat up a heating element in the bottom of the mug which keeps your drink hot. Multiple sensors are used to turn the mug on when liquid is poured in and to keep it at a consistent temperature.

Is Ember Mug really worth it?

Should you buy either of the Ember Mugs? There’s no denying that Ember’s mugs are expensive. Buy both and you’ll be out nearly $300—that’s enough to buy a high-end coffee maker. But if you’re serious about coffee, tea, or even hot chocolate, the Ember Ceramic Mug is absolutely worth the investment.

Do I need to turn my Ember Mug off?

The Ember Mug is pretty smart and generally speaking you don’t actually NEED to turn it off. When it doesn’t have any liquid in it and you’re not using it then it’ll go into a sleep mode where hardly any power is used. When you pick up your cup it’ll detect the motion and turn itself back on.