Specifications: 108 dB loud alarm with 4 feature modes – time delay, general alarm, constant alarm, and doorbell mode, allowing you to easily select the appropriate setting based on your needs. Wireless alarm powered by two AAA alkaline batteries (not included). Low power consumption design ensures operation for over two years. Low battery warning indicated by LED flashing once per second when battery replacement is needed. Features self-adhesive backing for simple installation and operation. Product dimensions: 3.4 x 1.7 x 0.4 inches. Multi-use application: ideal as a refrigerator, freezer, or fridge door alarm; suitable for window and door security in homes; effective for cabinet and storage protection in retail environments. Package includes: 1 refrigerator alarm unit, 1 magnetic strip, and 1 user manual. Wireless freezer alarm activates only when the door has been left open beyond the set duration of 3, 15, 30, or 60 seconds, preventing unnecessary alerts during normal use. Adjustable delay time allows customization based on preference. 108 dB loud alarm effectively helps detect unauthorized access through doors and windows. The door open chime provides an audible alert when doors are opened, useful for monitoring activity from 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 the selected duration (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, compatible with most freezers, refrigerators, and doors without requiring tools. Wide range of applications: magnetically triggered door alarm sensor designed for entry point monitoring on doors and windows. Suitable for use with safes, cabinets, freezers, refrigerators, sliding pool doors, stores, offices, apartments, hotels, and more.