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Here is a smart mug that combines with your phone to keep your drink hot for 3 hours. The Ember Travel Mug 2+ has a hidden LED display and simple touch controls. You can use your smartphone to change the temperature. With Apple Find My integration, you can use your phone or Apple Watch to locate your misplaced mug.
The Ember Travel Mug 2+ is IPX7 rated. It is fully submersible up to 1 meter deep. Ember is smart enough to wake up when you pour hot drink in it.