Raddy RF760 Operation Manuallines page 11

3. [ Lock ]: Set the LOCK, unlock/mute operation:
3.1 Setting locking and unlocking operations:
Long press the [LOCK] key for 2 seconds in the power-on or power-off
state, and the "
key functions.
Long press [LOCK] again for 2 seconds and "
will disappear to remove the LOCK function.
3.2 Set the mute mode:
When the radio is turned on, short press [LOCK] and "VOL 00" on the
display screen will flash and in the mute state. Short press [LOCK] to
restore the current sound level. The mute function has been turned off.
4. Operation for external DC5V input charging:
When the battery icon is empty, please connect the "DC5V power supply"
to charge the radio input by using Type-C charging cable (it is be supplied
in the original box).
During the charging process, the charging symbol " " will appear.
Press any key to illuminate the backlight.
After it is fully charged, the battery icon will show full.
5. 3.5mm headphone jack operation:
If you want to listen to the radio, you can use the internal speaker or the
3.5 mm plug earphone to avoid disturbing others.
6. Volume [VOL+, -]:
In the power-on state, short press "[VOL+] and [VOL-]", the volume will
increase or decrease by 1 step according to the minimum step.
Long press "[VOL+] and [VOL-]" to increase and decrease the volume
rapidly.
The volume can be set to any value between 00 and 40.
" symbol will be displayed on the screen to LOCK all
09
RF760 Full-Band Radio
" on the display screen