These work very consistently. Easy to install. On a few occasions the arm and disarm didn’t work, causing the alarm to go off when we opened the door. The alarm is very loud and is only turned off by disarming. Great for making sure you are aware that you child has opened the door. Arming and disarming beeps are very loud so you won’t be turning them on or off after people have gone to bed. You kind of stuck in the house if all the doors are armed and the child is sleeping. I would prefer a volume adjust on the arm/disarm beeps.
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