Yeah, you can turn an e-ink device completely off, unpowered, and it will continues to display whatever was on the screen, unchanged, until you power it and cha

Yeah, you can turn an e-ink device completely off, unpowered, and it will continues to display whatever was on the screen, unchanged, until you power it and change it. Any moment the display is not actually changing, it can be using zero power. Zero. That's the real amazing thing about e-ink.