Hyundai H-CMMD4043 - Manual (Page 23)

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General operations
Reset the unit
Operating the unit for the first time or after replacing the car battery, you must
reset the unit.
Press the RESET button on the front panel to restore the unit to the original
factory settings.
Power on/off
Press SRC button on the front panel or the POWER button on the RC to turn the unit on. Press and hold these
buttons for 2 seconds to turn the unit power off.
Note: After the unit is off, the volume level and radio current settings will be memorized, and when you turn the
unit on it will resume the stored status that you set.
Volume control
Rotate the VOL knob on the panel clockwise or press the VOL + on the RC to increase the volume level.
Rotate the VOL knob on the panel anticlockwise or press the VOL - on the RC to decrease the volume level.
Mute function
When the unit power is on press the MUTE button on the panel or the MUTE button on the RC to mute volume
control. Press it again or press the VOL +/- button to resume the volume.