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Secures your home dorm office or hotel room from intruders with added security! 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. An effective way to frighten away intruders. Easy no tool installation. Constructed of heavy gauge steel  Uses one 9-volt battery (not included). 29 x 43 x 1-1/2