Specifications: 108 dB loud alarm with 4 feature modes time delay, general alarm, constant alarm, and doorbell mode, 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: ideal for refrigerator, freezer, or fridge door reminders; suitable as a window or door alarm for home security; effective for cabinet doors in retail 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 3, 15, 30, or 60 seconds, preventing unnecessary alerts during normal use. Delay time can be adjusted based on preference. 108 dB loud alarm helps detect unauthorized entry through doors or windows. Door open chime provides audible notification when doors are opened, useful for monitoring children or pets.4-in-1 functionality: 1. Time delay alarm emits a Di-Di-Di sound increasing from 0 dB to 108 dB 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 Ding Dong sound when the door opens Easy to install simply peel and stick on most freezers, refrigerators, or any door surface without tools. Widely applicable magnetically triggered door alarm sensor provides protection at entry points such as doors and windows; suitable for use on safes, cabinets, freezers, refrigerators, sliding pool doors, stores, offices, apartments, and hotels.