37 full-size keys (3 octaves).
100% MIDI compliant.
Velocity sensitive.
Polyphonic aftertouch.
Pressure sensitive Pitch bend and Modulation buttons, with continuous MIDI control data.
Octave +/- push buttons.
Sustain button.
USB Powered (no external power supply needed).
Firmware upgradable via USB.
Configurable via Xkey Plus free app for iOS, Mac OSX, and Windows.
Connectors:
Micro USB connector (cable provided).
Activity indicator LED.
Dimensions:
Width: 388 mm (15.27 in)
Height: 135 mm (5.31 in)
Depth: 16 mm (0.62 in)
Weight: only 600 g (1.32 lb): less than an iPad!