Glass Break Alarm with 125dB Loud Alarm Our window alarm have 125dB loud alarm and built in vibration sensor, it can effectively detect vibration and breakage of glass and trigger an alarm, 125 dB loud alarm can deter and scare thief away. Easy To Installation And Use Window glass alarm is very easy to install, it can be installed in less than minute, no wiring is required, Simply peel and stick the alarm at the desired position at the window, then press the On/Off switch, LED flashing and Make a 'Di' sound, and the alarm is activated and ready to protect your home. Vibration Sensitivity Adjustment Design Window alarm with vibration sensor have sensitivity adjustment feature, you can adjust vibration sensitivity based on your need, which can prevent false alarm, turn to the tip, the lower the sensitivity. turn to the flat end, the higher the sensitivity. Battery Operated Window Alarm Door window vibration alarm is powered by batteries(included), battery standby time is up to 1 year, so you don't need to frequently replace battery, when battery voltage is less than 3V, LED will be flashing and remind you to replace the battery. Wide Application Window vibration detector sensor alarm have a wide application, it is just perfect for your home, office, garage, dorm room, or even RV. The 24-hour security alert system gives you more peace of mind, especially at night, so you can sleep with peace of mind.