Wireless freezer alarm: It will only alert you when freezer door has been left open for 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 need 108dB 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 for 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. Package including 2 pack refrigerator alarms + adhesive tapes Widely Use: Magnetically triggered door alarm sensor protecting house by door window entry and suitable for safe box, cabinet, Freezers, Refrigerators, pool sliding door, store, office, apartment, Hotel etc. - Product Size: 3.4*1.7*0.6 inch Package Including:2 x refrigerator alarms 2 x magnetic stripe 1 x user manual.Items from Sheng Xinshun's shop