CME Xkey Air 25-key Bluetooth MIDI Controller Bluetooth 4 MIDI controller with full size keys and low latency Powered by a lithium battery for hours of music creation Robust, high quality construction. same finish as a MacBook Works out-of-the-box with your favorite music apps on your favorite devices For iPhone or iPad, Compatible with hundreds of free and pro apps Made for travelers and mobile users Octave Change, Pitch Bend, Modulation, and Sustain function buttons Xkey Air is an ultra-lightweight controller designed for mobile use It is ideal for use with tablets and other mobile devices Constructed from rugged, brushed aluminum, it is not only an aesthetic match for MacBooks, it is rugged and roadworthy It only weighs 610g (1