You must first select the chronograph function on your AlpinerX watch. Press several times on the 3 o'clock pusher to get to the chrono function. By pushing the 4 o'clock pusher you can select the mode for intermediate times (Split or Lap).
The chronograph is started and stopped by pressing the 2 o'clock pusher. It is reset to 0 by pressing the 4 o'clock pusher, when the chrono is stopped.
When the chrono runs, pressing the 4 o'clock pusher will freeze for 10 seconds the intermediate time.
Count-up/down counters are started and stopped the same way.
In Split mode, the intermediate time gives the time since the start of the chrono (split time).
In Lap mode, the intermediate time gives the time since the last 4 o'clock push (lap time).
The count-up/down values can be set in the application in "my watch", "set count up/countdown".