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Mug coaster that converts cold/heat to charge your device

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A coaster that uses the heat/cold of the drink to charge your mobile phones. The Epiphany One Puck, which doubles as a drinks coaster, connects to a phone with a USB cable. It has two sides, one red, one blue. Owners use the red side as a drinks coaster to place a hot drink on it, and the blue side as  for a cooling drink such as a beer. It uses something called a Stirling engine to turn heat into energy.

https://www.awesomeinventions.com/innovative-ideas/



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