The Timer is used to remind you to take breaks from the computer and look at distant objects. There are several different modes
The timer is stopped and there will be no break reminding.
Normal mode looks like this
By default every 30 minutes this screen will be shown with countdown timer. You can change work and rest time from the Timer page
Strict mode doesn’t have this Skip rest button and can’t be skipped. Use it to force yourself to get up, but be careful not to lock your PC for long period of time.
Strict mode looks like this and can’t be skipped
Productive mode is one nice Pomodoro timer which can easily switched from rest to work. As the name it’s make for people who use work and rest combinations for productivity