These are sometimes sold under the "Boogie Board" brand name. They don't have any storage whatsoever, just a stateful LCD display. When you erase the page it's

These are sometimes sold under the "Boogie Board" brand name. They don't have any storage whatsoever, just a stateful LCD display. When you erase the page it's gone for good. There are probably apps you could use to take pictures before erasing, but ultimately these are just "infinite scratchpaper" devices. Still fun, though - I use mine for doodling.