4 in 1 Mode: This alarm with 4 modes. 1. Timing alarm (sounds 'Di-Di-Di' from 0dB to 108dB if the door remains open for 3153060s) 2. General alarm (stop alarm if door closed); 3. Constant alarm (constant alarm even closed door); 4. Door Opening Chime (Sounds "DingDong" once door is opened)Loud 108dB Alarm: Door and window alarm helps effectively deter intrudersthieves with a loud alarm of 108 dB. You can easily set the suitable mode according to your needs.Easy to Install: Simple peel and stick installation, easy to install on most freezerfridge or any door without any tools. package including 2 fridge alarms, 2 magnetic strips, double-sided sticker, user manual.Installation note: be sure to close the alarm and magnetic strip, distance of installation between them should not exceed 0.78 inch. The 2 parts must be aligned by their alignment arrow. 2 AA batteries can stay for 2 years. (Batteries are not included)Widely Used: Magnetic Trigger Door Alarm Sensor Protecting Home Through Door Window Entrance and Suitable for Safe, Cabinet, Freezers , refrigerators, swimming pool sliding door, shop, office, apartment, hotel, etc.Multi-use:1. Fridge, refrigerator, freezer door alarm reminder2. Window door alarm for home security3. Cabinet Door Alarm in Shop SecurityPackage including:2 x Refrigerator Alarms2 x Magnetic Stripe2 x double-sided sticker1 x user manualBattery operated, requires two AAA alkaline batteries (not included).It is a physical image. When the batteries are installed, the light will glow red.Low-power design:Low-power design, they can work for more than 2 years.Low battery warning, when batteries need to be replaced, the LED light will flash once per second.