The Calendar Watch is a simple smartwatch that uses an E Ink display below analog clock hands to show what parts of the day are busy. The watch is controlled by your smartphone - both the calendar display and the clock itself.

The Calendar Watch photo

The Calendar Watch was originally crowdfunded in 2016, but is now available at retailers such as Amazon starting at $230.

E Ink display info: 
Small round E Ink
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ynvisible ink kit - create your own electrochrommic printed displaysynvisible ink kit - create your own electrochrommic printed displays