Siren Safety Lock

Do not take chances when securing your entry doors. The Siren Safety Lock uses the same security found in many hotels. It allows you to open a door partially to see and speak with visitors while preventing the door from being opened fully For additional security a built-in alarm will sound if an intruder attempts to open the door. The alarm will not only alert you to the attempted break in but can also scare off the attacker and summon help. Requires 1 N size battery that is not included. The alarm unit measures 6.5 inches x 2.5 inches( at the widest point ) x 1.75 inches. The lock bracket measures 4 inches x 2.5 inches(at the base) x 1 inch.