Specifications 108 dB Loud Alarm 4 Operating ModesTime Delay, General Alarm, Constant Alarm, Doorbell, easy to set the appropriate mode as needed. Wireless Alarm Battery Powered, it needs two AAA alkaline batteries not included. Low Power Consumption Design, they can work for over 2 years. Low Battery Warning, when need to replace batteries, the LED light will flash once per second. Selfadhesive, easy to install and use. Product Size 3,41,70,4 inch MultiUse 1. Refrigerator, Fridge, Freezer Door Alarm Reminder. 2. Window Door Alarm for Home Security 3. Cabinet Door Alarm in Store Security. Package Includes 1refrigerator alarm 1magnetic strip 1User Manual Wireless Freezer Alarm It will only alert you when the freezer door has been left open for 3s15s30s60s, it will not annoy you while you want the door open, you can easily set the delay time as needed 108dB Loud Alarm Door and window alarm helps to detect intruder thieves effectively with 108dB alarm, also door opening signal will remind you of kids pets or others coming. 4in1 Mode This alarm with 4 modes. 1. Time delay alarm sounds DiDiDi from 0dB to 108dB if the door remains open for 3153060s 2. General Alarm the alarm stops if the door is closed 3. Constant Alarm constant alarm even if the door is closed 4. Door opening signal sounds DingDong when the door is opened Easy to Install Easy to peel and stick to most freezer refrigerator or any door without tools. Wide Application Magnetically triggered door alarm sensor that protects the house through door window entry and suitable for safes, cabinets, freezers, refrigerators, pool sliding door, shop, office, apartment, hotel, etc.