EverNary Glass Break Sensor Alarm perfect for securing your home windows and doors. Its sensor detects vibration and emits a 125 dB alarm and LED flashing, alert you of a potential break-in or Glass break.The alarm and LED flashing will stop after 30 seconds or turn off the power switch. Roller Ajustment Vibration Sensor Sensitivities can help to prevent false alarms. Alarm Device with ON/OFF button,Easy to turn it off when you don't need it alarm. The ultra-thin (0.35 inches) design of this alarm makes it perfect for use with any windows. Easy to install, simply peel and stick the alarm to any glass or sliding window/door, the vibration triggered alarm also suitable for wooden doors and windows, locker, painting, or any valuables youd like to protect. Low battery indicator alert you replace the batteries. Features: Alarm: 125dB and LED Flash Sensitivity: Roller Ajustment Power Supply: 3 * LR44 Battery (included) Dim.: 2.8*2.8*0.35 inches(72*72*9mm) Package: 6* Vibration Alarm (Double-Side tape include)18* LR44 Battery 1 * User Manual