Specifications: 108 dB loud alarm with 4 feature modes time delay, general alarm, constant alarm, and doorbell mode; easily set the appropriate mode according to your needs. Wireless alarm is battery operated and requires two AAA alkaline batteries (not included). Low power consumption design allows operation for over 2 years. Low battery warning indicated by LED light 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 applications: 1. Refrigerator, freezer, or fridge door alarm reminder 2. Window or door alarm for home security 3. Cabinet or storage door alarm for retail or office 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 a set duration of 3s, 15s, 30s, or 60s, preventing unnecessary alerts during normal use. Adjustable delay time allows customization based on preference. 108 dB loud alarm helps detect unauthorized entry by triggering a high-decibel sound. Door open chime provides an audible alert when doors are opened, useful for monitoring activity around children, pets, or in commercial spaces. 4-in-1 functionality: 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 until manually reset 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 most freezers, refrigerators, doors, and cabinets. Widely compatible with various applications including residential, commercial, and hospitality environments. Ideal for use on doors, windows, safes, cabinets, freezers, refrigerators, sliding pool doors, stores, offices, apartments, and hotels.