Glass Breaking Alarm with 125dB Sound AlarmOur window alarm has 125dB sound alarm and built-in vibration sensor, it can effectively detect vibration and glass breakage and trigger a alarm. A loud alarm of 125 dB can deter and scare the thief. Easy to install and use The glass break detectors are very easy to install, they can be installed in less than a minute, no wiring is required, just peel and stick the alarm to the desired position on the window, then press on/off switch, the LED flashes and makes a "Di" sound, and the alarm is activated and ready to protect your home. Vibration sensitivity adjustment design Window alarm Glass break detectors have sensitivity adjustment function, you can adjust the vibration sensitivity according to your needs, which can avoid false alarms, turn to the tip, the lower the sensitivity. Turn toward the flat end, the higher the sensitivity. The battery operated window vibration sensor alarm is powered by 3 batteries, the standby battery life is up to 1 year, so you don't need to replace the battery Frequently, when the battery voltage is lower than 3V, the LED will flash and remind you to replace the battery.