The idea to use heat disparities for power is over two centuries old, and we've seen larger concepts make use of thermo-electrics. The One Puck brings mobility into play, providing us with device that charges through a USB cable, including Android devices and iPhones.
The Epiphany One Puck hides a small Stirling engine inside the coaster, turning heat disparities into usable energy. The generator works best with either very hot drinks or very cold drinks, since they create the highest amount of heat disparity.
The device has two sides; a blue side for cold drinks and a red side for hot drinks. According to its creators, a hot drink is the optimal way to charge a device. It comes with a USB port that can charge any device that draws 1000 mA or less. This means it can charge iPhones, Androids, iPods and other USB-based devices.
Since it's small enough to be pocketable, you can bring the coaster anywhere you go. That means, you can charge your phone while having coffee at Starbucks or a cold beer at the pub without having to sidle up next to an available outlet
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