Wireless Door and Window Alarm: Wireless Home Security Door and Window Alarm with 125 DB Volume Alarm Notifies You When a Door or Window Opens Easy to Install: Door contact with double-sided adhesive, just peel off the sticker and stick it, it can be installed within 1 minute. Alarm kit with siren for door and window opening detectors and intrusion prevention Real-time alarm reminder: when someone opens the door, the door alarm will trigger the alarm immediately (the minimum trigger distance is 1cm) LOW BATTERY INDICATOR: The door open detector is powered by 3 batteries (included), 12 months standby time. Low battery indicator tells you to replace batteries Door Open Alarm: The door alarm kit can be used not only to protect the safety of your family, but also for intruder or door open refrigerator alarm. Scope of delivery: 1 piece Product color: silver + black Product size: main body size: 75*39*12.2mm, magnetic stripe size: 32*11.5*10mm