Example: if you set the countdown to 60 minutes, then the app will create the following notifications which will tell you how much time is left:
* 35 minutes left
* 20 minutes left
* 13 minutes left
* 8 minutes left
* 5 minutes left
* 3 minutes left
* 2 minutes left
* 1 minutes left
* Lift Off

Each notification will read out the remining time (text-to-speech).

and by the way:
* no tracking
* no ads
* no account or Internet connection required
* no backend

Have fun.