Bluetooth-enabled tags and trackers aren’t exactly new but they all have one limitation in common. Aside from the range limit of Bluetooth itself, of course. Because of the electronics required to make them work, they require energy sources, often the thinnest and smallest of batteries. But if semiconductor startup Wiliot successfully proves its new tech, they won’t have to. Bluetooth trackers can be as small and as thin as a postage stamp and get what little power they need almost from the air.