Specifications:108 dB Loud Alarm4 Feature Modes --- Time Delay, General Alarm, Constant Alarm, Doorbell, easy set the appropriate mode according to your need.Wireless Alarm Battery Operated, it need two AAA alkaline batteries ( not included ).Low Consumption Design, they can work compatible with over 2 years.Low Battery Warning, when it need replace batteries, the LED light will flash once every second.Self-Adhesive, easy to install and operate.Product Size: 3.4*1.7*0.4 inchMulti-Using:1. Fridge, Refrigerator, Freezer door alarm Reminder.2. Window door alarm compatible with home safety3. Cabinet door alarm in store security.Package Including:1 x refrigerator alarms1 x magnetic stripe1 x user manualWireless freezer alarm: It will only alert you when freezer door has been left open compatible with 3s/15s/30s/60s, it will not annoying you while you want the door open, you can easily to set the delay time as your need108dB Loud Alarm: Door and window alarm helps detecting intruder/thieves effectively by 108dB alarm, also door open chime will remind you if children/pet or others are coming/leaving.4-in-1 Mode: This alarm with 4 modes. 1. Time Delay Alarm (sounds ?Di-Di-Di? from 0dB to 108dB if door stays open compatible with 3/15/30/60s) 2. General Alarm (alarm stop if door closed); 3. Constant Alarm (constant alarm even door closed); 4. Door Open Chime (sounds ?DingDong? once door opens)Easy to Install: Simple peel and stick on most of freezers/fridges or any door without any tools. Widely Use: Magnetically triggered door alarm sensor protecting house by door window entry and suitable compatible with safe box, cabinet, Freezers, Refrigerators, pool sliding door, store, office, apartment, Hotel etc.Products from BAZHOU's store