Specifications: 108 dB loud alarm 4 functional modes - ordinary alarm, continuous alarm, door closing reminder mode, doorbell, can easily set the appropriate mode according to needs. Wireless alarm battery powered, requires two AAA alkaline batteries (not included). Low consumption design, can work for more than 2 years. Self-adhesive, easy to install and operate.Multipurpose: 1. Refrigerator, freezer, freezer door alarm reminder. 2. Window and door alarms for home security 3. Cabinet and door alarms for store security. Loud alarms: Door and window alarms effectively detect intruders/thieves with 108dB alarms, in addition, the door opening bell will alert you if children/pets or others are coming/leaving.4-in-1 mode: There are 4 modes for this alert.1. General alarm (doors and Windows are opened to alarm, closed to stop alarm)2. Continuous alarm (press this button to go out, enter the alarm mode after 10 seconds, after opening the door at home, long press the shutdown button within 5 seconds to pull the guard, and the alarm will ring for 30 seconds if the guard is not withdrawn)3. Door closing reminder mode (if the door is not closed after 5 seconds, it will sound "Di-Di-Di", and the sound will continue to grow louder until the door is closed)4. The door bell (which makes a "ding dong" sound when the door opens) is easy to install: without any tools, it can be easily torn off and pasted on most freezers/refrigerators or any door. Versatile: Magnetic trigger door alarm sensors protect homes through door and window entrances, suitable for safes, cabinets, freezers, refrigerators, pool sliding doors, shops, offices, apartments, hotels, etc.Package includes: 1 x refrigerator alarm 1 x magnetic strip