Abstract: The timing system for a game or timed event comprises a mobile device (1) including a transmitter (4) adapted to transmit a wireless electromagnetic radiation signal from the field of play. At least one receiver (5) is located outside the field of play in any one direction to a maximum distance allowed by radio frequency laws to receive such signal. Each of the device (1) and the main scoreboard (2) has a timer system (9, 10), adapted alternately to start and stop timing in response to each actuation signal from switch (3). Hence any interruption of time played in the game is made visible and conveyed to the supporters in an unambiguous way, and which allows the umpire or referee on the field to control the game absolutely. With a further need to improve refereeing decisions an addition to the system, a 4th official device (A) also located outside of the field of play in a game or timed event, that includes:—A receiver (B) adapted to receive signals from the mobile device transmitter (4).