Akai Professional LPK 25 wireless, Wireless USB and Bluetooth MIDI keyboard, 25 x Velocity-sensitive mini-keys, MIDI via Bluetooth to iOS and Mac OS X (Bluetooth LE4), MIDI via USB to Mac OS X and Windows, Arpeggiator with 4 octaves, Buttons for octave up and down and tap tempo controls, Plug-and-play USB port for Mac and PC does not require driver installation, Four programmable memory banks for instant recall of personal presets, Arppeggiator Modes: Up, Down, Inclusive, Exclusive, Order, Random Latching, or Current functionality, Tap tempo button (internal synchronisation), can also be synchronised with software (external synchronisation), USB port, 6.35 mm TS sustain pedal input, USB or battery powered (3 AA, not included), Dimensions (W x D x H): 365 x 124 x 36 mm, Weight: 490 g, Including editor software for Mac and PC@+*System Requirements:*@+@+, Mac via USB port: OS X 10.9 or higher, IOS via USB: 8.0 or higher and Camera Connection Kit (Not included - sold separately), Mac via Bluetooth: OS X 10.10 or later with Bluetooth 4.0, IOS via Bluetooth: 9.0 or higher with Bluetooth 4.0, Windows: Only USB connection with Windows 7 or higher