My guess is that it will use some form of e-ink. Once set, they don't draw power and would only need to refresh a bit to reset it to something else like "stolen

My guess is that it will use some form of e-ink. Once set, they don't draw power and would only need to refresh a bit to reset it to something else like "stolen" etc... But of course, there would be bootleg ones pretty soon. These will get reverse engineered in short order.