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) 108dB Loud Alarm: Door and window alarm helps deter intruder/thieves effectively by 108dB loud alarm, also door open chime will notify you if kids/pet/elder are coming or leaving unexpected. You can easy to set appropriate mode as your need. Easy to Install: Simple peel and stick installation, easy to install on most of freezers/fridges or any door without any tools. package including 2 pack refrigerator alarms, 2 magnetic stripe, double sided sticker, user manual. The electronic instruction is on the eighth picture. Installation Note: Ensure close the alarm and magnetic strip, the installation distance between them should not exceed 0.78 inch. The 2 parts need be aligned by their alignment arrow. 2 AA battery can stay 2 years.(batteries are not included) 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. color: white size: as show Package Including: 2 x refrigerator alarms 2 x magnetic stripe 2 x double sided sticker