Need privacy and security? Check out the Door Jammer. It is a simple way to prevent unwanted intrusions into any room and provide peace of mind. It is the perfect solution for traveling, working, home, hotels or dorm rooms. Important: There needs to be a small space of at least 1/8 inch below the door for the base of the Door Jammer to slide under. This space is normally found in interior doors but not under all exterior doors.