Ruizu D16 - 4.Display; 5.Shutdown settings; 6.Audio; 7.Button lights

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4.Display:
Brightness: Set screen brightness.
Backlight Time: Set time of screen backlight.
Screensaver: Turn on/off screen saver.
5.Shutdown settings
Sleep timer: Set time into sleep mode.
Power management: Set time for auto shutdown.
6.Audio
Equalizer: Choose from the 6 sound effects,
or choose "off" to turn off equalizer.
Volume limit: Adjust the maximum sound volume.
Speaker on\off: Turn on/off speaker.
7.Button lights
Turn on/off the button lights.
8.Information
View system info and memory space on the device.
9. Format device
Delete all data in Mp3 system.
10.Default settings
Reset system to factory setting.