Maybe you don't understand something! but the device itself beeps for 5 seconds and is very quiet! The application generates an alarm correctly!
Goods received, but without cr123 battery! Everything works as in the description. I recommend!
To help from accidental leaks and costly repairs to neighbors. It is very rare when you need it, but it will pay off in one go!
Excellent sensor, I have already purchased a second one, I recommend it for purchase.