Designed with 20-gauge steel to improve security on hinged and sliding doors the Guard Dog Door Keeper Alarm prevents forceful entry of even the largest intruders. The adjustable system allows the door bar to slide to fit most standard sized doors. Want to use on a sliding door? Simply remove the top yolk pin and Door Keeper is ready for action. Whether at home, school or the office, the Door Keeper Alarm keeps what you want out.

• Highly sensitive: 120db Loud Alert Siren.
• Made with heavy duty: 20-gauge steel for strength and security.
• Dual-function: Prevents forced entry on a hinged, patio, and sliding doors.
• Fit most standard doors and sliding patio doors.
• No tools are required: Simply adjust the bar length using the release button.
• Portable and compact: Making it easy to store and ideal for travel.