The only negative thing is that it does not have a loud alarm sound if the door opens, but there is an option for 2-3 notification sounds for two seconds that if someone is sleeping deeply, they will not hear them. Maybe from the mobile phone with the appropriate setting (which I have not found yet), the sound can be heard louder and for a longer duration

It does what it says. I have had it for a year and the battery is okay.
WARNING: The magnet with the sensor must be less than 1 cm away. If you have a security door that protrudes from the frame significantly, it will not work

Quality construction, easy installation and programming.
Immediate response to notifications.
Plug 'n' Play / Value for money

Underutilized and versatile,
notifications in a split second directly to your mobile.
It's worth every penny and more.
When connected to the homebase, you can also see the battery percentage, which is very useful

Continuous connection with the homebase and instant notifications through the application. The sensor is larger than the Xiaomi one but works better, without losing connection from its base.