Starbucks starts selling Ember mugs, which keep your drink at a steady temp for hours

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Last year, Ember Technologies, Inc. ran a crowdfunding campaign on Indiegogo to build a mug that keeps hot drinks at the perfect sipping temperature. By now, it’s sold 4,000 of these devices.

And in something of a coup for the startup, Starbucks Corp. has begun selling Ember Temperature Control Mugs in its stores across most of the U.S. and online for $149.95.

Whether it’s coffee, cocoa or tea, hot drinks are usually prepared and served around 160° Fahrenheit, said Ember CEO Clay Alexander — and that’s how cafes and restaurants mostly serve them. Yet, people like to drink hot beverages closer to 130°.

Commonly available thermoses work with simple insulation, but they heat unevenly and don’t cool drinks when they are searing, resulting in plenty of burnt tongues. Ember works with semiconductors inside to bring a drink to the ideal temp and hold it there it for hours, Alexander said.

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