Get a Window Glass Alarm to not only alert you to intruders, but also to scare some off before they even approach your house. These standalone alarms are ideal for windows and glass doors. They are designed to detect glass vibrations, which will set them off if glass is broken or being tampered with. With a high/low sensitivity setting, you’ll be able to avoid false alarms. Protect your house visibly with the SABRE® Window Glass Alarm. FEATURES: Standalone glass alarm Reaches up to 100 dB and audible up to 300 ft. away Detects glass vibrations to sound off when glass is broken or tampered with High/low sensitivity settings help prevent false alarms Easy to install with no wiring required Ideal for windows, sliding glass doors, and patio doors Warning on the back is visible from the outside to scare intruders away Requires 2 CD2032 batteries (included) Model: HS-GA2