The best lost model alarm and finder - the Dronekeeper Mini

Have you ever lost your quad because you've crashed and the battery has fallen off? The Dronekeeper mini has it's own batter that powers it's on board buzzer for up to 2.5 hours. It's really easy to set up and small enough to fix to your quad with out effecting it's weight too much. It's less than 6g.
It's also cheap and robust.
All around, it's an awesome piece of tech.