Bilco
Barracuda DSI
The Barracuda DSI model protects inward swinging doors. With the door closed, the product is placed on the floor and the user slides the metal plates under the door. Pushing outward on the handles engage the plates to the exterior door jamb and the device is securely locked in place by simply inserting a pin. To secure an outward swinging door, the DSO model is positioned so that the bar rests on the door jamb on either side of a closed door and the built-in hook is placed over the door handle. The device is secured by spinning the turn handle until it is snug in place.
http://www.bilco.com/Barracuda-Intruder-Defense-System.html