Actually r4di0fly3r’s motion-tracking turret probably won’t keep intruders out. But it will startle them. And it will probably keep cats and dogs out from sheer terror of “OH GOD WHAT IS THAT.”
This has to be the coolest thing I will see today. I need at least two to stand guard by my apartment. Not only does this currently uncased Portal turret track its victims with a camera, but it can even shoot (non-lethally) at them.