Firestone Audio Fubar 3 MkII USB DAC/Headphone Amp - Black USB input - Play music directly from your computer via USB. Requires no addition software or drivers. Headphone Output - connect your favorite headphones to the 1/4" (6.4mm) headphone jack. Analog Inputs NEW! - connect your iPod, CD player or other analog device. RCA Outputs - Using the Gold Plated RCA outputs you can connect the Fubar 3 to your home stereo. Volume Control - Controls the headphone output.