FlashStickers

Why exactly are only discovering this brand new way to annoy people with our cellphone? These look like they've been around forever in Europe, but for some reason we've never ever seen a FlashSticker—a little plastic decal that flashes whenever you get a call—over here in the States. They don't require batteries (or Bluetooth) to work, either,
apparently the stickers are powered by radiation emitted from your cellphone, something which it is always
very comforting to be reminded of. Only six euros a pop, but they'll customize them with your corporate logo or whatever else you want if you order in bulk.

[Via textually.org]