The Pomodoro Technique is a time management method developed by Francesco Cirillo in the late 1980s. It uses a kitchen timer to break work into intervals, typically 25 minutes in length, separated by short breaks. Each interval is known as a pomodoro, from the Italian word for tomato, after the tomato-shaped kitchen timer Cirillo used as a university student.[Wikipedia]

How to use the Pomodoro Clock?

Set estimate pomodoros (1 = 25min of work) for your work task.  Start the clock and focus on the task for the session length(usually 25 minutes).Take a break for the break length(usually 5 minutes). Iterate 3-5 until you finish the tasks.