Specifications: 108 dB loud alarm with 4 feature modes – Time Delay, General Alarm, Constant Alarm, and Doorbell, allowing you to easily set the appropriate mode according to 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 every second when battery replacement is needed. Self-adhesive backing for easy installation and operation. Product size: 3.4 x 1.7 x 0.4 inches. Multi-use application: 1. Fridge, refrigerator, and freezer door alarm reminder 2. Window and door alarm for home security 3. Cabinet door alarm for store security Package includes: 1 x refrigerator alarm, 1 x magnetic strip, 1 x user manual Wireless freezer alarm activates only when the freezer door has been left open for 3s, 15s, 30s, or 60s, preventing unnecessary alerts during normal use. Adjustable delay time allows customization based on preference. 108dB loud alarm helps detect unauthorized entry effectively. Door and window alarm features a chime function to alert when doors are opened, ideal for monitoring children, pets, or general access. 4-in-1 modes: 1. Time Delay Alarm – emits a “Di-Di-Di” sound increasing from 0dB to 108dB if the door remains open for 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 – simply peel and stick on most freezers, refrigerators, or any door surface without tools. Wide application – magnetically triggered door sensor suitable for use on doors and windows for home security, as well as on safes, cabinets, freezers, refrigerators, sliding pool doors, stores, offices, apartments, and hotels.