4.Instruction of buttons and menu settings of RETRO NANO

[Operation explained]
Power on and off: Slide the power push button to power on and off the device.
Multifunction button: Click to switch UI, double click to switch working mode, long press to enter/Exit menu.
Adjust volume: Short press the previous/next track button to turn up/down the volume.
Switch songs: Hold the previous or next track button.
Wake up the display: After powering on the device,clicking any button will wake up the display.
Note: Long press the volume up and down buttons to change songs, press the play button to pause, it works under Bluetooth and USB mode. 
[Menu operation explained]
Activate menu: When the device powers on and not on the menu page, hold the multifunction button for about 2s.
Exit menu: On the menu page, hold the multifunction button for about 2s.
Switch/Confirm menu: On the menu page, short press the previous/next track button to switch submenus, and short press the play/pause button to confirm.
[Introduction to main menus]
CHGPR: Charging protection
ON: When the battery is charged to 80%, the USB will stop charging the battery, but will still provide power for the system.
OFF (by default): The USB will charge the battery and provide power for the system.

GAIN
The RETRO NANO supports H/L two levels of gains.

EQ
8 presets+3 user EQ are supported:  JAZZ POP ROCK DANCE R&B CLASS HIP-HOP RETRO USER1 USER2 USER3
You could set the custom USER EQ via the FiiO Control APP.
Note: EQ works on both Bluetooth and USB mode.

DIMMER
Adjust screen brightness level: 1~4.

OFF-DISO
If no key is pressed within the set time, the screen will automatically turn off. The setting time range is 15s, 30s, 1min, 5min,NEVER.

MODE
Switch between Bluetooth, PC and phone three working modes.

语言\LANGUAGE
Switch between Chinese and English
(The language selection page will show when turning on the first time or after factory reset. )

RESET
Reset all pairing and setting information of RETRO NANO.

VER
RETRO NANO firmware version.