This watch has been specifically designed for referees and has 4 synchronised time functions on its display. First, the referee chooses the number of periods of play (up to 10 hours). Then the length of time or game time periods may be entered and then the breaks between periods. At the end of the first half clock 4 will start automatically and determine the break period until the start of the next half. At the beginning of the game clock 1 and 2 start in parallel with each other. At the break clock 1 will pause whilst 2 continues. Clock 3 will automatically measure the duration of the break or interruption (for determining injury time) until clock 1 resumes.