With a name like Burglar Blaster ($600) you’d want to coax a burglar just to see it in action. Housed in a high-strength, cast aluminum/alloy case, this battery-powered unit uses a passive infrared detection system to protect areas up to 2,000 square feet. When triggered, the Burglar Blaster releases 4-ounce of irritating pepper spray, rendering any would-be intruder to turn tail.