120db 9V Low Power Home Security Alarm Automatic Burglar Alarm Sensor Door Window Sensor Description:   This product is small and exquisite, easy to install on the door or windowwith double-sided adhesive. The alarm can be issued more than 120 dB alarm sound, scaring thieves to remind the owner and the surrounding thief when the thief into the door. What's more, you can control it with the switch (ON/OFF) to open the door and windows.   Features: Easy to install. You can directly suction on the metal objects by the back of the disk or use its own adhesive paste. ON / OFF button design, the siren will alarm during the door or window opened when turn on the ON button. Contrarily, it will stop. 120 db high-sounding alarm, scare thieves effectively remind the owner and the surrounding thief. Low power consumption with 9V power. Small and exquisite design. Specifications: Sound pressure: 120dB Power supply: 9 volt 6F22 battery-powered(battery is not included) Size: 5.3*2.3*10cm/2.1*0.9*3.9in Cable length: 12cm/4.72in Package List: 1 * Burglar Alarm Door Window Sensor