4 in 1 Mode: This alarm has 4 modes.1. Timing alarm ("Di-Di-Di" sound from 0dB to 108dB)2. General alarm (stopping the alarm if the door is closed);3. Continuous alarm (continuous alarm when the door is closed);4. Doorbell ("ding dong" sound when opening the door)Loud 108dB Siren: The door and window siren helps effectively deter intruders/thieves with a loud siren of 108dB. You can easily set the appropriate mode according to your needs.Easy Installation: Simple peel and stick installation, easily installs on most freezers/fridges or any door without no tools.Package includes 2 fridge alarmsInstallation Notes: Be sure to turn off the alarm and the magnetic strip, and the installation distance between they must not exceed 0.78 inches. The 2 pieces must be aligned by their alignment arrows.2 years on 2 AA batteries. (Batteries not included)Wide range of uses: magnetic trigger door alarm sensor protects home through door and window entrances, suitable for safes, cabinets, freezers, refrigerators, sliding pool doors, shops, offices, apartments, hotels, etc.4 in 1 108dB magnetic door alarmscenes to useWide range of uses: the magnetic trigger door alarm sensor protects the entrance of the house window through the door, suitable for safes, cabinets, freezers , refrigerators, sliding pool doors, shops, offices, apartments, hotels, etc.Easy Installation: Simple peel-and-stick installation, easily installs on most freezers/refrigerators or on any any door without any tools.Wide range of applicationsmultifunctional:1. Fridge, fridge, freezer door alarm reminder2. Home Security Door and Window Alarms3. Shop Security Cabinet Door AlarmPackage Included:2 Fridge AlarmsBattery powered, requires two AAA alkaline batteries (not included).This is a physical image. When the battery is installed, the LED lights up red.Low-power design:Low-power design, can work for more than 2 years.< p>Low battery warning, LED indicator flashes every second when the battery needs to be replaced.