Stopwatch time is accurate to hundreths of a second. There is also a lap time feature which allows you to pause the counter and display the time at which it was paused while still counting up in the background. When used in stopwatch mode, the program can track how much time you spend on a project for which you're being paid by the hour or similar situations. When it goes off, you can click the snooze button to automatically reset the alarm to go off a short time later to allow you to sleep a little longer. In alarm clock mode, you set a specific time of day and day(s) of the week that you would like the alarm to go off.