As part of the educational project EPS of Bernart of Ventadour College in Limoges, here is an application developed for APSA speed relay based on the 12 second race of principle.
The application offers 2 sound timers:
1 time of 6 seconds to calculate the starting speed and stopped flying start
1 time of 12 seconds to calculate the target speed (average speed from standstill of the runner and the starting speed launched relayed)

The format is compatible with a smartphone.