Normal working state display:

Leftmost digit on top:
         Input channel indicator, either 1,2,3.
2nd and 3rd digit on top:
         Volume control number , from 00 to 99 range.
digits on bottom:
         Input signal sampling rate indicator; 44.1, 48.0,88.2, 96.0, 176, 192, 352 and 384 are for the PCM formats, while 064, 128, 256 and 512 are for the DSD formats.

Button functions：
Up button: (Only available while user want to change the set  feature .)
        Push the up button once, the digit of bottom will blink, which indicates it is selected. This allows changing the corresponding setting. Push the down button to select the desired value. While the display is still blinking, push up button again , the next digit to the right will be selected and blink.
         While the rightmost digit of bottom is blinking, push the up button one time, the menu will change to page 2. While the rightmost digit of the page 2 is blinking, push the up button one time, quite the set menu and back to the normal state. If the digit is blinking but without push any buttons in 6 seconds, quite the set menu and back to the normal state auto.

Down button: (Mulriple functions.)
         While the display is in normal state (not blinking), it allows selecting the input source in decreasing order. The leftmost digit on top will be displayed:
"1", for the USB digital input. (For Windows , the computer must install the driver for recognize the device. Mac, Linux, IOS and Android don't need driver install.)
"2",for the HDMI-IIS digital input; (The HDMI-IIS need the source HDMI-IIS output has the same pin definitions for compatible and work. It can't work with the TV or computer standard HDMI output .)
"3", for the RCA coaxial digital input;
         While the display is blinking, the down button for set the menu value for change the setting.

Knob:
         For change the volume .

Setting state display：
Menu Page 1:


Digit on top:
         When push the up button , the digit on top show the product inside temperature of celsius .

The leftmost digit on bottom: input channel select
        Input channel indicator, either 1,2,3.

The second digit from the left  on bottom: Gain select.
        H mean high gain 26DB.
        L mean low gain 13DB.

The 3rd digit on bottom: Output channel select
        H mean for headphone output ,
        P mean for preamp output (with volume control),

Menu Page 2:


The leftmost digit on bottom: OS and NOS mode select.
        While working under oversampling (OS) mode, the lower the oversampling level is, the warmer the sound will be. While working under non-oversampling (NOS) mode , the sound even more warmer and smoother. The possible values are:
        n : NOS mode.
        2 : 2X oversampling
        4 : 4X oversampling
        8 : 8X oversampling

The second digit from the left  on bottom: The DAC and Preamp output select for the rear outputs.
        P : The rear output ports with volume control .
        2 : The rear output ports with 1V RMS DAC output level .
        3 : The rear output ports with 1.5V RMS DAC output level.
        4 : The rear output ports with 2V RMS DAC output level.
        5 : The rear output ports with 2.5V RMS DAC output level .

The 3rd digit on bottom: Display auto-dimming setting
        A (Auto Dark) : Enables the display's auto-dimming; the display will dim 10 seconds after the buttons are left untouched, only keeping a LED bar lit to indicate the unit is turned on. As soon as a button is touched, the display will turn back on.
        b (Bright) :  Disables the display's auto-dimming, the display will remain on at all time.

HDMI definitions : (Apply HDMI transmit the IIS signal, the pin's definitions must exact same )