Quickly prevent unwanted entry wherever you are with the DoorJammer Portable Door Security Device. This gadget keeps you safe by effectively stopping anyone from entering a room without permission. Featuring a patented system, any horizontal force applied on the door from outside turns into downward force, wedging the DoorJammer into the ground. Compatible with most doors, DoorJammer takes just a few seconds to set up, preventing forced or unwanted entry right away. In case of emergency, you can simply pull the handle upward to remove DoorJammer. Likewise, it easily lifts away from its locked position in an instant. Ideal for all types of travelers, the portable device adds a sense of security to any room you stay in, including hotel, guest, dorm or hotel rooms. DoorJammer is also suitable for offices, classrooms or restrooms that don’t have proper locks.