Vibration-sensing alarm with a volume of 130dB, ideal for door and window security. - Type: Window/Door Security Alarm - Volume: 130dB - Function: Vibration-sensing alarm FUNCTION: Door/Window Alarm with Vibration Sensor This alarm is equipped with a vibration sensor that detects glass breakage or when a door or window is forced open. It emits a loud alarm to immediately deter intruders. OPERATION: This sensor is designed to be installed on any window and is easy to set up. Peel off the sticker on the back and attach it to the door or window, then switch it to "ON". After the LED flashes for 5 seconds, the alarm will activate when the sensor detects vibration, alerting you to a potential intrusion with a 130dB alarm sound and scaring off thieves. BATTERY INSTALLATION: With a low voltage LED indicator. When the voltage drops below 3V, the indicator light will flash red every second. Remove the battery cover and install 3 new LR44 batteries.