One of the easiest and least expensive means of making home invasion much more difficult and time consuming, is both inexpensive and easy. It does so by making even ordinary doors much harder to bust in, unless you totally destroy the door.
What you need:
One to three 60d (60 penny or 6”) nails.
Metal tube sheaths, 1 per nail, about 3” length, a little wider than the nail.
Concrete drill bit slightly wider than sheaths.
Strong metal/concrete glue.
Dustoff or spray can air.
Drill from 1 to 3 holes in the concrete in front of the door that swings in. Use the dustoff to blow any sand out of the hole(s). Test to make sure the sheaths can fit in each hole. Then glue each sheath into a hole.
Once the glue is dried, and the door is shut, drop a nail into each sheath. That door will be very hard to bust open, giving you much more time to recover your firearm.
I found this just now looking for some info on laser dazzlers.
http://www.protectglobal.com/front-page/products/fog-cannons/qumulus
Might be handy in delaying a perp doing a home invasion. Between that and strobe, even a swat team would have trouble finding their way to the bedroom.
Wonder how the tube and nail for gutters from the isle in Home Depot would work.