it gives you an aux 3.5mm jack that can be used as a straight fwd line in.
, an ipod connector ( I've never used this as I don't have an ipod )
, and a USB port.
I plug a USB memory stick into it. The headunit then see's each album on the memory stick as a CD, as if you had a 100 CD changer in the car. Title's and track names are NOT displayed, instead the display shows something like CD9 Track 12.