Specifications: 108 dB loud alarm with 4 feature modes – Time Delay, General Alarm, Constant Alarm, and Doorbell mode, allowing you to select the appropriate setting based on your needs. Wireless alarm powered by two AAA alkaline batteries (not included). Low power consumption design enables operation for over 2 years. Low battery warning indicated by LED flashing once per second when battery replacement is needed. Features self-adhesive backing for easy installation and operation. Product dimensions: 3.4 x 1.7 x 0.4 inches. Multi-use application: 1. Refrigerator, freezer, or fridge door alarm reminder. 2. Window or door alarm for home security. 3. Cabinet or storage door alarm for commercial or retail environments. Package includes: 1 x refrigerator alarm, 1 x magnetic strip, 1 x user manual. Wireless freezer alarm activates when the door has been left open for 3, 15, 30, or 60 seconds, allowing customizable delay settings to prevent unnecessary alerts during normal use. 108 dB loud alarm helps detect unauthorized entry or open doors, providing an effective deterrent. The door open chime feature gives an audible alert when doors are opened, useful for monitoring access by children, pets, or others. 4-in-1 mode functionality: 1. Time Delay Alarm – emits a "Di-Di-Di" sound increasing from 0 dB to 108 dB if the door remains open for a set duration (3/15/30/60 seconds). 2. General Alarm – alarm stops when the door is closed. 3. Constant Alarm – continues sounding even after the door is closed. 4. Door Open Chime – produces a single "Ding-Dong" sound when the door opens. Easy to install with peel-and-stick adhesive; no tools required. Suitable for use on most freezers, refrigerators, doors, and windows. Wide range of applications: Magnetically triggered door alarm sensor ideal for securing entry points in homes, offices, apartments, hotels, stores, cabinets, safes, freezers, refrigerators, and sliding pool doors.