Very cool technology for fun and pest control IMO !
http://www.paintballsentry.com/
http://www.youtube.com/watch?v=RxBa5bQfTGc
Beats my sprinkler scarecrow all to hell !
Thanks for the ping ......LOL !
Beats the heck out of my feeble attempts, using a radio-controlled model tank as *bait* to lure the cats into the range of one of these....