The program issued the message (as usual dialog windows and pop-out tray Baloon Hints - of your choice) on the need to relax or re-start to work through your specified intervals of time - can help protect your computer from the harmful effects of your eyes.
In addition to issuing messages can program after the specified periods of time to play the sound formats WAV, MP3, switched on and off the monitor, and run any files - EXE, AVI, etc. From the menu you can configure the program to start automatically when you start Windows. At any given time you can pause the program or to continue it again, selecting the item "Pause" context menu, or click on the program icon in the system tray.