Native Instruments Traktor Kontrol S4 MK2 DJ Controller Industry-standard 4-deck controller, soundcard, flagship TRAKTOR software. TRAKTOR software disc is not included and needs to be downloaded free of charge Improved look, feel, and visual feedback. Line Inputs : Frequency Response +/-0.5 dB 20 Hz-40 kHz Plug and play with TRAKTOR DJ for iPad and iPhone