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  1. 3.5mm (1/8in) Analog Source Input: 3.5mm analog audio jack for line-level input from an external source.
  2. Gain: Push-button toggle between low or high gain amplification. Always use the lowest gain necessary.
  3. 6.35mm (1/4in) Output: 1/4-inch stereo analog audio jack for studio headphones. Performance is identical to a 3.5mm jack.
  4. Power Switch: On/off button. When system is on, sends a shutdown signal to the OS. Holding it will force shutdown.
  5. Volume Dial: Controls the volume of all audio outputs.
  6. Analog Outputs: RCA stereo (left / right) analog audio outputs.
  7. USB 2.0 Port(s): Universal Serial Bus (USB) port for connecting USB 2.0 and older devices (480 Mb/s).
  8. Power Input: Power input port: 12 VDC, 1 A, center-positive, not included. Not required if USB port is connected.