TFA KlimaLogg Pro Gebrauchsanweisung Seite 36

Note:
Changes at the setting-mode require no additional confirmation and are
automatically saved when you leave or go further to the next setting.
If you press and hold the "+" or "-" button, you are quickly taken through
the possible settings (time, date and time zone settings).
LCD-contrast:
Time zone:
Alarm sound ON/OFF: