MiBeacon

Bluetooth iBeacons are used for various purposes - proximity alerts / finding keys / phones / locating indoor areas or items of interest.
This app simply enables you to locate the beacons around you (which could be attached to items - such as a keyring or iPhone or other beacon device hidden from view).
The app also supports WiFi access points, this assists in WiFi access point location in the same way and can alert when moving our of the coverage area.