9
Functions: Power on or off the device, change the volume of the
speaker
Function Key
Function: Change working mode from 1 to 4. The mode changes circle.
Left Key
Functions: Different in every mode.
Mode 1:
If in Auto mode, switches the working mode between Average FHR
mode and Transient FHR mode.
If in the Manual mode, press it once, count the fetal heartbeat sound
heard, when count to 15 times, press the button again, the FHR will be
worked out and displayed on screen.
Mode 2:
If in Play music mode, press the button can change the music from 5 to 1
gradually and circle.
If in Warn sound on or off mode, press the button can open or close the
warn sound.
If in FHR restrict configure mode, press the button can decrease the
restrict value.
Mode 3:
No function in Playback mode, the functions in the other modes are
same as mode 2..
Mode 4:
Same as mode 1.
Right Key
Functions: Different in every mode.
Mode 1:
Close or open the backlight in the Auto calculating mode.
Same as Right button in the Manual calculating mode.
Mode 2:
Change the music from 1 to 5 gradually and circle in Play music mode.
Open or close the warn sound in Warn sound on/off mode.
Increase the restrict value in FHR restrict configure mode.
Mode 3:
No function in Playback mode.
Same as mode 2 in other modes.
Mode 4:
