Geemarc ClearSound BDP400 User Manual page 19

The telephone will then say: "Set month" and the month
number digits on the display will flash. Press either the
" " or " " button to toggle through the months in
numbers between 1-12 (each of which will be shown and
announced as a month), and press "Ok" button to confirm
when set.
Press the "PB" button to exit and the telephone will beep.
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