“iBeacon is not a hardware play. It’s actually a way to distribute software to create the first API layer for the physical world. And here’s the magical part: it’s completely free of charge from a power perspective. Beacons use effectively zero power themselves, and soon will last forever. But even more importantly, scanning for beacons at the OS level also uses zero power. Think about that for a second: with iBeacon, Apple made a way for your phone to constantly ‘see’ signs (i.e. scan for BLE signals), all the time even when on standby, without using any power at all. This is truly a remarkable breakthrough for location technologies. Beacon IDs are all individually unique (as unique as IP addresses). So in actuality, beacons can be thought of as place URLs for the real world.”
http://stevecheney.com/on-the-new-edge-network-and-the-future-of-local-commerce/#fn2-997