Numark NS7III | 4-Channel Motorized DJ Controller & Mixer with Screens and free Remix/Sampling Program downloads Premium Serato DJ controller with three high-resolution color screens, including the ability to display stackable waveforms Stacked parallel waveforms on central screen for simple, direct visual beat matching Screens provide 1:1 real time feedback of Serato DJ, letting you close or move the source laptop and focus on the music Dedicated track library screen with corresponding navigation controls;Road-worthy metal construction Plug and play with Serato DJ Pro (included)no upgrade purchase required