[Freezer Door Alarm with Time Delay and Widely Used] Upgraded versions with 3/15/30/60 seconds time delay for your choice. Magnetic trigger door alarm sensor protecting home through door window entrance, suitable for safe, cupboard, freezer, fridge, fridge, swimming pool sliding door, shop, office, apartment, hotel, etc. [4 in 1 multifunction and easy to use] 4 modes meet your multi-options: general alarm, constant alarm, time delay (alarm when the door is closed) & doorbell, just press the button to select the function you want without complications to select the setting. [108 dB loud enough for your home security] Door and window alarm helps effectively deter intruders/thieves with a loud 108 dB alarm. [Professional security system with easy installation] Easy peel and stick installation and low power design that provides convenient and convenient protection long-term. You can work more than 2 years. 4 in 1 multifunction General/normal alarm Constant alarm Alert door closing (time delay) Doorbell Simply press the button to set the appropriate mode according to your needs. Low consumption design Battery operated, it requires two AAA alkaline batteries (NOT included). Low Consumption Design, they can operate for more than 2 years. Low battery warning, when batteries need to be replaced, the LED indicator flashes once per second. Doorbell Doorbell for office, store, home, etc. . Freezer/fridge/refrigerator door alarm with time delay French door alarm for home security/child safety