The GzOne (available on Japan's KDDI network only) is a waterproof and shock resistant clamshell phone - ideal for sports. It has a small external E Ink display to show a clock, message notifications, etc.

W62CA GzOneW62CA GzOne
E Ink display info: 
Small monochrome E Ink display
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ynvisible ink kit - create your own electrochrommic printed displaysynvisible ink kit - create your own electrochrommic printed displays