HanRongDa HRD-747, Руководство по эксплуатации

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3. [Lock] Set the LOCK, unlock/mute operation
3.1 Setting locking and unlocking operations:
In the radio ON/OFF state, long press LOCK 2 seconds, it will display
. Then, all the buttons could not be operated. Long press [ LOCK ]
again for 2 seconds, when the symbol disappear, all buttons can
be operated.
3.2 Set the mute mode:
Radio on working state, short press [ LOCK ]. "VOL 00" symbol is
flashing, radio will enter the mute mode. In the mute state, short
press [
LOCK ]. Restore the current sound level, at this time mute
function is disabled.
4. External DC5V input power supply operation
When the battery symbol shows a space, please connect the charging
cable of Type-C (factory standard accessories TYPE-C USB cable) to
the DC5V power supply to power the radio input. During the charging
process, the battery symbol " "will keep flashing. After full charge,
the battery symbol stops flashing and displays full.