MIDI INSTRUMENT CONTROLLER Korg MIDI controller keyboard microKEY2-37. 37-key Natural Touch Mini-keyboard. Drivers: Tone wheel, Modulation wheel, Octave buttons. Change of Octave -3 - +3. Assignable switch jack connections, USB Type B (x1). Power: Two AA batteries (when connected wirelessly, use alkaline or nickel-metal hydride batteries). USB bus power (when connected via USB). Electric consumption: Less than 100mA. Battery life: Approximately 30 hours (with alkaline batteries). Dimensions (W x D x H): 565 x 139 x 54 mm. Weight (without batteries): 1 Kg. Included items: USB cable, KORG Software Bundle code. Operating requirements: OS X10.8 Mountain Lion or later installed, iOS8 or later installed, Windows: Microsoft Windows 7 SP1 or later (32-bit / 64-bit).