ESI M4U eX, USB 3.0 MIDI Interface, With a total of 8 MIDI ports, Each port can be used as input or output, Automatic input and output detection, Multicoloured LEDs for status display, Additional functions allow the interface to be used as a thru or merge box, Powered via USB or via the AC adapter included, Class-compliant - without drivers under Windows 7, Windows 8.1, Windows 10 and Mac OSX (32/64 Bit), Dimensions: 175 x 120 x 45 mm