Window Alarm System 4-Pack - Ultra-Loud 120Db Alarms With Advanced Vibration Plastic Specialized Window Alarm System: This window alarm is specifically designed to offer security to glass windows in your home, garage, office, RV, or dormitory, including both sliding and traditional windows. Advanced Glass Vibration Sensor: The product comes with a built-in vibration sensor and provides high/low sensitivity settings, reducing the chances of false alarms. Powerful 120 dB Alarm: Upon detecting vibration, the window security alarms emit a loud 120 decibel alarm that lasts for 60 seconds. Visible Warning Sign: The glass door alarm includes a red LED light that flashes every 4 seconds, serving as a potent deterrent to potential intruders. Additional warning stickers enhance the preventative aspect of the security system. Low Battery Indicator: The red LED light also serves as a low battery indicator. When the battery runs low, it will flash rapidly, signaling that a battery replacement is needed. Powered by AAA Batteries: This window security sensor requires two AAA batteries (not included). Its wireless, easy-to-install design allows for a peel-and-stick application on any window or glass.