Meet the FES Watch U: a new e-paper wristwatch made from a single piece of e-paper that combines with an iOS and Android app for watchface customization and lasts up to 2 weeks on battery. It features Bluetooth 4.1 technology and lets you install up to 24 patterns.
More gadgets like this: here
As this video shows, you can change the design of the face and band with the press of a button. More info is available here.
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