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 operated 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 per second when battery replacement is needed. Features self-adhesive backing for easy installation and simple operation. 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 or storage door alarm for commercial use Package includes: 1 x alarm unit, 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 effectively detects unauthorized entry through doors or windows. ble chime alerts when doors are opened, helping monitor activity from children, pets, or others. 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, or 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 single "Ding-Dong" tone when the door opens Easy installation with peel-and-stick adhesive – compatible with most freezers, refrigerators, and doors without requiring tools. Wide range of applications: Magnetically triggered sensor provides security for entry points such as doors and windows. Suitable for use on safes, cabinets, freezers, refrigerators, sliding pool doors, stores, offices, apartments, hotels, and more.