you could put a little passive gps chip in it like they have for pets and subscribe to the service locating it via laptop!! (or just rub a steak on it before takeoff.. and bring your dog along... [sm=spinnyeyes.gif] )

Seriously you could probably rig up a beeping noise (little speaker/buzzer) that could run off your battery w/activation by elevator servo in full down (completing the circuit) or something like that... so you basically wouldn't hear it or have it draw power until needed... They're tiny and put out lots of shrill noise.. check radio shack... Sounds little extreme but definately doable.
Mike