Glass Breakage Alarm with 125dB Loud Alarm Our window alarm has 125dB loud alarm and built-in vibration sensor, it can effectively detect vibration and glass breakage and trigger an alarm, 125 dB loud alarm can deter and scare away the thief. Easy to Install and Use Glass break detectors is very easy to install, it can be installed in less than a minute, no No wiring is required, Simply peel off and stick the alarm to the desired position on 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 Glass Break Detectors has sensitivity adjustment function, you can adjust the vibration sensitivity according to your needs, which can prevent false alarms, turn to the tip, the lower the sensitivity. turn to the flat end, the higher the sensitivity. Battery Operated Window Alarm Window Sensor Window Vibration Alarm is powered by 3 batteries(included), the battery standby time can be up to 1 year, so you don't need to replace the battery frequently, when the battery voltage is lower at 3V, the LED will flash and remind you to replace the battery. Wide Application Family Security Burglar Alarm has wide application, it is simply perfect for your home, office, garage, dorm or even camping car. Product description: Product name: Vibration window alarm Product dimensions: 7.2*7.2*0.95cm Battery: 3x Battery (included) Alarm power: 0.28 W Material: Environmentally friendly APS Alarm decibel: 125 dB White color Package included: 2 X window alarm