Glass Break 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 sound an alarm, an alarm powerful 125 dB can deter and scare away the thief. Easy to Install and Use: Glass break detectors are very easy to install, it can be installed in less than a minute, no wiring is not necessary, just peel and stick the alarm to the required position to the window, then press the on/off switch, LED flashing and make '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: Glass Vibration Sensor Alarm is powered by 3 batteries(included), battery standby time 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. Wide Application: Home Security Burglar Alarm has wide application, it's just perfect for your home, office, garage, dorm room or even RV. Product Description: Product Name: Vibration window alarm Product dimensions: 7.2*7.2*0.95cm Battery: 3x Battery (included) Alarm Power: 0.28W Material: APS Environmental Friendly Alarm Decibel: 125dB White Color Package Included: 2 X Alarm window