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 3/15/30/60s) 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)<br> <br> Loud 108dB Alarm: Door and window alarm helps effectively deter intruders/thieves with a loud alarm of 108 dB. You can easily set the suitable mode according to your needs.<br> <br> Easy to Install: Simple peel and stick installation, easy to install on most freezer/fridge or any door without any tools. package including 2 fridge alarms, 2 magnetic strips, double-sided sticker, user manual.<br> <br> 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)<br> <br> 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.<br> <br> <br> Multi-use:<br> <br> 1. Fridge, refrigerator, freezer door alarm reminder<br> <br> 2. Window door alarm for home security<br> <br> 3. Cabinet Door Alarm in Shop Security<br> <br> Package including:<br> <br> 2 x Refrigerator Alarms<br> <br> 2 x Magnetic Stripe<br> 2 x double-sided sticker<br> <br> 1 x user manual<br> <br> Battery operated, requires two AAA alkaline batteries (not included).<br> <br> It is a physical image. When the batteries are installed, the light will glow red.<br> <br> Low-power design:<br> <br> Low-power design, they can work for more than 2 years.<br> <br> Low battery warning, when batteries need to be replaced, the LED light will flash once per second.