Pentax OPTIO WS80 Operating Manual page 133

-- Green button
I
2
3
Press the Green button in
I_1 mode.
The camera enters the Voice Recording
mode. The remaining recordable time and
the recording time of the current file appear
on the display.
1 Recording time
2 Remaining recordable time
Press the shutter release button
fully.
Recording starts. The self-timer lamp blinks
during recording.
You can record sounds continuously for up
to 24 hours.
When the Green button is pressed during
recording, an index is added to the current sound file.
Press the shutter release button fully.
Recording stops.