Keep your latte, chai, coffee or tisane at exactly the right temperature down to the last sip with this ingenious mug. Sleek and modern in slate grey, the Ember mug maintains your desired temperature for over an hour thanks to a built-in battery. Or use the matching charging coaster to keep your drink perfectly hot all day long. Designed with a slim, elegant handle, the mug makes a thoughtful gift for someone who's constantly warming up or topping off their coffee.