3 Packs Door Window Alarm 130dB Strong Clear Magnetic Security Anti-Intruder Warning Sensor Simple Installation Responsive Vibrating Sensor for Home Apartment

Burglar Alarm: When someone tries to break the window or forcibly enter the room, an alarm will be triggered immediately to alert you of the presence of the intruder. Easy Installation: No tools required, peel off the protective film, stick on window or door, press the on/off button to activate the alarm, protect your belongings from burglars. Easy to use: turn on the switch, the indicator light flashes, 5 seconds later, it works, when the product detects a vibration, it emits a 130dB alarm, after 30 seconds, the alarm stops. Glass breakage alarm: Vibration sensors are perfect for detecting broken glass or intrusion attempts. Low battery indicator: Low battery LED indicator, when the voltage is less than 3 V, the indicator light flashes, please remove the battery cover, install a new one.