Audio [HELP] USB Audio Interface

Hi guys,

I need a USB Audio Interface for the mall I work for. Basically, I need something that will read a USB drive, and play the music from it, preferably from a playlist (.m3u). The audio needs to come from that box and go to the back of an amp.

Basically, something like this >>

I was just wondering if there were any other products like this around, as I can't seem to find any.
Current Smartphone: Samsung Galaxy S4 i9500 (Black Mist)