Quote Originally Posted by rbeau30 View Post
Anyone have these?

"12 Gauge Perimeter Alarm System"

http://www.americanspecialtyammo.com/Gadgets.html

Might be useful to have a few in the supplies.
As has been said in current times these are illegal. In other times there may not be anyone around to worry about.

And you can build your own with a piece of 2X4 and a mouse/rat trap.