Power input jack: Connect to a power supply.
Power input switch: Turn ON/OFF power of the unit.
Earth terminal: Connect to earth(ground).
External power input jack for AUDIO USB PORT: If you want to use external power to AUDIO USB PORT, you can use 6.5Vdc ~ 9Vdc, 2A power.
Power switch for AUDIO USB PORT: Turn ON/OFF +5.0v power of AUDIO USB PORT. If the connected USB audio device use USB port power, switch to ON.
AUDIO USB PORT: Connect to USB audio device.
USB port: Connect to non-USB audio device if needed.
LAN port: Connect to a router by network cable.
VGA port: Connect to a monitor by VGA cable if VGA display is needed.
HDMI port: Connect to a monitor by HDMI cable if HDMI display is needed.
Line-out jack: Main board analog audio output jack.
Mic-in jack: Main board microphone input jack.