American Audio QSD 4 Ch19 Inch Mixer With An SD Slot To Play Files 4 channel mixer with advanced SD function SD card slot built in for fully functioning mp3 playback will accpt up to a 4GB SD Card (does not accept SDHC cards) 4 channel professional 19 inch mixer (2 phono, 4 line, 4 aux, 2 mic inputs) folder and track selector knob large LCD display easy to navigate 4 channel mixer with advanced SD function 4 channel professional 19 inch mixer (2 phono, 4 line, 4 aux, 2 mic inputs) Folder and track selector knob Large LCD display easy to navigate SD card slot built in for fully functioning mp3 playback will accept up to a 4GB SD Card (does not accept SDHC cards)