The Ember App can have up to 3 Embers paired to it at one time! To pair a new Ember, start at the home page of the Ember App. Here you will see the current temperature or "empty" if there are no liquids. Please swipe down in the center of the page to reveal all the mugs that are paired! From here you will be able to select which mug you would like to control and pair a new device.
Pairing for the first time? Check out this article