Portable MIDI keyboard controller from Xkey series that provides wireless Bluetooth 4 connectivity and weighs only 880 g, so it is 20% lighter than an 11-inch MacBook Air. It provides 37 full size, velocity-sensitive keys with polyphonic aftertouch, is 100% MIDI compliant and is powered by a rechargeable lithium battery for hours of music creation. Both recharging of the battery and firmware updates are provided via included Micro USB cable. The controller can be used with any music apps on various devices, including iPhone and iPad, as well as free Xkey Plus application for custom configuration of the keyboard. The controller also provides pressure sensitive Pitch Bend and Modulation buttons, Octave +/- push buttons and Sustain button, indicator LEDs for activity, connection state and battery status, and robust, high-quality aluminium body that has the same finish as a MacBook. Dimensions: 553 x 135 x 16 mm.