it’s an “e-paper” display, which annoyingly is nothing like an e-ink display. it’s an LCD with a memory chip in it. the bangle.js also has one, which can do eight colors. so better than the black and white one, but worse than the 64-color one. also it’s half the price of the cheaper pebble…
a bangle.js is probably a better investment, as it sports the same always-on display and 30 day battery life for about half the price.