SIIG 7.1 specs

•Volume (+, -): Increases or decreases the system volume. Supports analog speakers only.

•Audio Out: Connect headphones or stereo speakers via mini-3.5mm stereo plug. Doubles as an S/PDIF Optical out when used with the included S/PDIF Optical adapter.

•Volume Mute: Press this button to turn off the system sound. Press the button again to turn on the system sound, pause for several seconds between button presses. Supports analog speakers only.

•Microphone/Line In Mute: Press this button to mute Microphone/Line In. Press the button again to turn on Microphone/Line In.

•Microphone/Line In: Connects MP3 players, CD players, iPods and other audio output devices for playback* or recording, connect a microphone and turn your system into a P.A.* or Karaoke* system. *Note: Playback, P.A., and Karaoke supports analog speakers only.

•Power/Activity LED: The light will be on when the system is powered up. The light will blink when activity is detected, however, the light is not affected by Microphone/Line In inputs.

•Microphone LED: When the Microphone/Line In is muted, the light will turn on.

•USB Connector: Plugs into the system's USB port.