"Freezer Door Alarm Alert: They can as a friger door alarm, if your fridge door is open by kids,it will sound DiDiDi to remind you until the door is closed.(Set mode4).Fridge door alarm:goes off if the Fridge or Freezer door stays open for 15 seconds.It will only alert you when freezer or fridge door has been left open for 15s,(Set mode 5)Multiple 5-in-1 Mode Alarm: Burglar Alarm (door alarm for kids safety)Door bellSoundsDingdong as a magnetic door chimes when door opens for businessConstant Alarm (door alarms 30seconds even door closed) Di Di sensor alarm(Sounds Di di di. a good refrigerator alarms for kids ) Fridge Door alarm with delay 15s(as a fridge door alarm when left open, it will start 15s stop after 30s).3 Level Adjustable Volume From 80dB to 130dB. : The Magnetic sensor door/window alarm loud enough to notice.Not only it can be used to protect your home safety, prevent children from leaving the house without inform, it also can be used to remind you that the doors /windows / medicine box, refrigerator or Freezer door are not closed.Portable & Easy to install: Use Double-sided tape, tape it on the Fridge door or any where you need, then all done! No any wiring or screws needed.Fit for Home, office, apartment, garage, pool door, medicine box, refrigerator,Freezer etc. Also for trip.Instant Alarm Reminder: The minimum trigger distance is 0.59 inch.The alarm will be triggered and alarm immediately when doors or windows be opened. Double side magnetic sensor alarm: More places can use it than single side sensor.This product does not contain batteries.