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 operates on 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 use. Product dimensions: 3.4 x 1.7 x 0.4 inches. Multi-use application: 1. Fridge, refrigerator, or freezer door alarm reminder 2. Window or 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 door has been left open for 3, 15, 30, or 60 seconds, preventing unnecessary alerts during normal use. Adjustable delay time allows customization based on preference. 108 dB loud alarm helps detect unauthorized entry through doors or windows. The door open chime provides an ble alert when doors are opened, useful for monitoring access by children, pets, or others. 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 – plays a “DingDong” sound each time the door opens Easy installation with peel-and-stick adhesive on freezers, fridges, or any door surface; no tools required. Wide application: Magnetically triggered door alarm sensor suitable for use on doors and windows for enhanced security. Ideal for refrigerators, freezers, cabinets, safes, pool sliding doors, stores, offices, apartments, hotels, and more.