Specifications: 108 dB loud alarm with 4 feature modes Time Delay, General Alarm, Constant Alarm, and Doorbell. Easily select the appropriate mode according to your needs. Wireless alarm powered by two AAA alkaline batteries (not included). Low power consumption design allows 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 safety 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 3, 15, 30, or 60 seconds, preventing unnecessary alerts during normal use. Adjustable delay time for customized settings. 108 dB loud alarm helps detect unauthorized access by triggering a high-decibel sound. Door opening chime provides notification when doors are opened, ideal for monitoring children or pets. 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 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 on most freezers, refrigerators, or any door surface without tools. Wide application: Magnetically triggered door alarm sensor suitable for doors and windows in homes, safes, cabinets, freezers, refrigerators, sliding pool doors, stores, offices, apartments, and hotels.