TFA HiTrax Tip Handbuch Seite 26

11.0 Timer Mode
Press and hold the [mode] button to select the setting display. The
'hour' digits start to flash. Press the [start/stop] button or [reset]
button to scroll through the setting.
Confirm with [mode] button. Set the 'minute' and 'second' digits in
the same way. The maximum time is 99 hours, 59 minutes and 59
second.
Press and hold the [mode] button to exit the setting sequence. The
setting display will change to Currant Time Mode automatically if
NO keystroke has been activated for 1 minute.