ForaCare FORA D40 Owner's Manual page 24

NOTE
While setting speaking volume, number 0 indicates that the speaking
function is off. "
from low to high. They will be displayed together with "
The time, date, speaking volume and memory deletion can ONLY be
changed in the setting mode. Therefore, these parameters cannot be
changed while performing tests.
During the setting mode, you can press On/Off button to turn off the monitor.
While the monitor is in the setting mode, it will turn off automatically if left idle
for three minutes.
24
" will not display. Numbers 1 to 7 indicate speaking volume
A1-24
."