The Alarm Security Bar from Ideaworks secures your home, dorm, office or hotel room from intruders. It is added security that is sure to give you peace of mind! As soon as the doorknob is touched, the alarm will sound like a powerful siren or barking dog to warn you that someone is trying to enter. The heavy gauge steel construction ensures that it is a rock solid security bar. It expands from 29” to 43” so that it will fit any door.