Phase One 645 AF - Manual (Page 76)

Ready beep
“Ready beep” is the small beep that sounds from the back when ready
for a new capture.
The “Ready beep” signals that the P+ back is ready for next capture.
“Ready beep” can be either “Single”, “Multi” or “Off”. Default is
“Single”
“Multi” is for use in noisy surroundings, i.e. where it can be difficult to
hear if it was the back or the flash that made the ready beep.
Restore def. (Defaults)
Selecting restore defaults will restore the settings of the P+ back to its
default settings. Be careful before using this option as all settings made
in the P+ back will be reset to factory settings.
Time & Date
In “Time & Date” you can set the time and date using the four buttons
on the P+ back. Left side buttons will step through the hours, minutes
and seconds field, while the right up and down buttons can be used
to set the value of the fields. The time and date is applied to all files
captured with the P+ back.