This 7.5" Black and White ePaper Display Module is the latest low-power technology. It offers a crisp, hi-contrast, easily readable display with the lowest power requirements around. Once you update the display, you can literally remove all power/connections and it will keep whatever is on the screen indefinitely.
The EPD screens are perfect for shelf labels. They don't update very quickly so they're ideal for mostly static applications that require updating infrequently such as signage, or electronic labels or tags.