Используйте приложение APKPure
Историческую версию Take Your Marks - for swimmers - можно получить на Android
Начните практическое приложение для пловцов. Очень простой и удобный в использовании.
This is the app for start practice for swimmers.
When you push start button,
(Whistle) -> "Take your marks" -> (Start Sound)
is playing.
The interval between "Take your marks" and "Start Sound" is randomly set.
Noise can be running. You can practice in a competition environment.