Inky wHAT is a low-energy, red/black, red/black/white or yellow/black/white electronic paper display for the Raspberry Pi. Multi-colour EPD displays, like the one on Inky wHAT, use ingenious electrophoresis to pull coloured particles up and down on the display. The coloured particles reflect light, unlike most display types, so they're visible under bright lights.
The unit comes fully-assembled, with the display securely stuck down to the Inky wHAT PCB and connected via a ribbon cable. The Inky wHAT is compatible with all 40-way Raspberry Pis.
To get the wHAT up and running, you can use the one-line product installer:
curl https://get.pimoroni.com/inky | bash
And follow the instructions!