The installation of the smoke detectors is going well. The app is user-friendly. You do have to create an account to use it, but afterwards you can install the app on multiple smartphones, so everyone in the family can be kept informed. You can test your smoke detectors via the app to see if they make noise.
You can also drop off via the smartphone, then you don't have to take a ladder to get to the button, easy.
We have installed 3 smoke detectors, 1 on each floor. Upstairs there is little WiFi range, but that is absolutely no problem for this smoke detector, it works fine!
Hopefully they never go off :)