The Eton Rukus Solar is a portable Bluetooth sound system with solar panels and a SURF (segmented) E Ink display. This is an outdoor sound system - hence the Solar and E Ink display...

The Rukus Solar is now shipping for $150.

E Ink display info: 
Segmented (SURF)
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ynvisible ink kit - create your own electrochrommic printed displaysynvisible ink kit - create your own electrochrommic printed displays