Professional usb-midi dj mixer* built-in powered 2-port usb hub to connect additional controllers easily(ie: 2 x kontrol one).* world first: innovative “channel select inch lever switch. Use it to control 4mixer channels at once.* high quality replacement crossfader and faders.* 6 rotary dials with center click for control over eq. Bands.* 2 rotary dials without center click for control gain function.* 2 rotary dials without center click plus a mini fader for control master* monitor and monitor mix functions.* 9 push buttons back illuminated for clear vision in dark zones.* 1 special mini rotary dial for control xfader curve/slope.* 2 level meters with 10 led segments to monitorize correctly the mixing.* mini lever switch included to duplicate the functionality of the vumeters.* special size and shape to be used with modular dj hardware controllers.* self powered. The mixer one usb connector allows it to be powereddirectly from a compatible usb bus. There is an optional external powersupply plug.* strong metal case and high quality components for a longer lifetime.* win mac and linux compatible. the mixer one is a professional dj usb-midi mixer controller designed specifically to enjoy the mixer emulation of the dj pro softwares. Compact and full featured layout(…yet easy to use) to mix without losing a beat.the built-in powered 2 port usb hub make it the ideal partner for the kontrol one midi controller. Just connect a single usb cable to the computer for a full dj setup! (mixer one + 2 kontrol one). Mixer one is a partnership product of dj-tech and kontrol dj hardware manufacturers. Mixer one will satisfy the needs of the djs that still want the tactile experience of djing with digital media in computer based systems.