MASTER KEYBOARD Korg microKEY 25 MIDI controller keyboard. Keyboard: 25 Keys (natural, velocity-sensitive mini-keyboard) Drivers: Joystick, Arpeggiator button, Sustain / TAP button. Octave change: -4 - +4. Connections: USB: Type B (x1). Power supply: Via USB bus. Electric consumption: less than 100mA. Dimensions: microKEY-25: 395 x 131 x 53 mm. Weight: 0.65 Kg. Accessories: USB Cable, KORG BUNDLESOFTWARE PIN Card. System Requirements, Mac: Supported computer: Apple Macintosh with USB port, which meets the operating requirements of Mac OS X or Apple Macintosh with Intel support. Supported operating system: Mac OS X10.5 or later. Windows, Supported computer: Computer with USB port, which meets the operating requirements of Microsoft Windows XP / Vista / 7. Supported operating system: Microsoft Windows XP SP3 (32bit), Microsoft Windows Vista SP2 (32bit, 64bit) or Windows 7SP1 (32bit, 64bit)