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 alarms Installation 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 alarm scenes to use Wide 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 applications multifunctional: 1. Fridge, refrigerator, freezer door alarm reminder 2. Home Security Door and Window Alarms 3. Shop Security Cabinet Door Alarm Package Included: 2 Refrigerator Alarms Battery powered, requires two AAA alkaline batteries (not included). < p>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.