Or, you know, just look for the gaggle of people congregating and milling about at a random point in the parking lot.
That doesn't work either for all ! I certainly would depend more on your suggestion than the Trackr that is mentioned. Just started with a few this week and I am very disappointed to say the least.
I wouldn't pplace that on my Sling until the tech gets to the point where it acts like a lowjack so I could find it if stolen.
Definitely think I am getting two though. One for my wife's keys...if we can ever find them again, and one for the dog who just loves 'saying hi' to people when they pass by the house and he keeps them company.