25 full-size keys.100% MIDI compliant.Velocity sensitivity.Polyphonic aftertouch.Pressure sensitive Pitch bend and Modulation buttons, with continuous MIDI control data.Octave +/- sensitive buttonsSustain buttonUSB Powered (no external battery needed).Firmware upgradable via USB.Configurable via free app for iOS, Mac OSX, and Windows.Width : 388mm (15.27 in)Height : 135mm (5.31 in)Depth : 16mm (0.62 in)Weight : only 600g (1.32lb): less than an iPad!Micro USB connector (cable provided).Activity indicator LEDIncluded in PackageXkey.Micro USB cable.User Manual.2 Years Warranty.