I've always liked the simplicity and practicality of that Add-a-Lock portable door lock, but this Door Jammer device looks even easier to use. Just wedge it under any inward opening door and give it a kick. It also appears to require a lot less fumbling around to remove when I need to take a leak at 3 a.m. and forget I locked my door. Why won't you open? Why are you doing this to me?! I have to piss like a Russian racehorse after 3 liters of German beer!
The Door Jammer serves as a portable security device that converts horizontal force exerted on the outside of a door into vertical force that prevents it from opening on the inside. The attachment works on all doors with at least a 1/8" gap below them, plus on top of all types of flooring. Great for keeping out intruders, nosy people, and the 3 hippies you got stuck sharing a hostel room with in Florence.
Muchas danke to Manny for the Dude Product Tip.