The Flash for electronic sports timing serves to visualize the precise instant of the start by means of an optical signal. It is a fact that starting-pistols also produce optical signals (flame and smoke) but they cannot be considered as reliable. In swimming competition, the problem is made worse by the fact that the starter is not in a convenient view of the swimmers.

The great advantage of an optical signal is to be visible by all competitors and viewers simultaneously as the propagation time delay is negligible.

Furthermore, an optical start signal is indispensable for competitors who are deaf or hard-of-hearing.

The Flash also enables the spectators to know the precise instant of the start in case of high ambient noise level covering the sound starting signal. In spite of its advantages, the Flash is not foreseen to replace the sound starting systems, but it serves as a valuable complementary device.