poweroff time can be set as any integer values between 0 and 24h. (Note that
this function will be disabled when it is set to OFF.)
HOLD switch settings
If the HOLD switch is turned on, you can enable/disable any buttons, touch
screen.
Volume setting
a.System Maximum volume setting: all other volumes will be lower than this
volume after setting it.
b.Power-up default setting:set the volume of the system when the device is
turned on.
Rotate screen
The display page will rotate 180° if it is enabled.
Double tap to wakeup
If it is enabled, double tap the screen can wake up the M15S when it is under off
or in sleeping states.