The CST-01 is a thin, flexible E Ink watch. The whole device is just 0.8 mm thick and weighs just 12 grams. It can full charge in 10 minutes (and runs for about one month). The lifespan is said to be about 15 years.

CST raised over $200,000 on Kickstarter to start production, but as of June 2015, it is facing production issues and the project's future is uncertain.

E Ink display info: 
SURF E Ink
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