Korg microKEY Air 25, 25-Key MIDI keyboard, With Bluetooth for wireless operation on iPad, iPhone, Mac or PC, Compact natural touch mini-keyboard, Joystick, Arpeggiator button, Sustain / TAP button, Octave Shift button, Sustain button connection, Power supply via 2x AA battery or USB, Dimensions (W x D x H): 395 x 131 x 52 mm, Weight: 670 g, Incl. KORG software bundle code as well as USB cable@+*System Requirements Wireless:*@+@+, Mac with support for Bluetooth 4.0 or higher and OS X10.10 Yosemite or higher or iPad / iPhone with support of Bluetooth 4.0 or higher and iOS8 or higher, PC with Windows 8.1 or higher (32 bit / 64 bit) and Bluetooth 4.0 as well as BLE MIDI drivers@+*System Requirements USB:*@+@+, Microsoft Windows 7 SP1 or higher (32-bit / 64-bit), Mac OS: Mac OS 10.8 Mountain Lion or higher, iOS8 or higher