Meet the FES Watch U: an elegant wristwatch made from a single piece of e-paper that offers you up to 2 weeks of battery life. It lets you change its patterns with the press of a button. The watch comes with pre-installed watch faces and strap designs. It is compatible with iOS and Android devices.
FES Watch U consists of an active matrix type flexible electronic paper display with a thin, lightweight design. It connects to your smart devices via Bluetooth.[Source]