Dentmate LEDEX WL-070 - Check the status of the battery; The setting of beep sound

2.7. Check the status of the battery
Battery Status Numerical
Fully charged ≥4.2
General 4.1~3.5
Low ≤3.4
a). Push and hold the MODE button for more than
4 seconds.
b). Read the numerical code that shows on the
display.
When the battery is in a low status, the display will
glow and show the sign of “Lo”.
Press the MODE button for 6 seconds until the
display shows or .
2.8.
The setting of beep sound
6