APK4Fun collected total 2 versions for Jau: The Music Timer APK (com.techn.workoutplayer). You could download one of the legacy or old version of it.
Jau: The Music Timer App Version History
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Jau: The Music Timer v1.3 APK (Latest Version APK)
► Updated: October 3, 2018
► What's New in Version 1.3:
Google Analytics removed
Android Oreo support added
more transparent permission management implemented -
Jau: The Music Timer v1.2 APK (Old Version APK)
► Updated: October 24, 2016