It is an elegant work of art. It?s also a fine instrument that follows you wherever you go. The black and white keys are supported by a cool silver colour aluminium panel arching down at the front and a holder hidden at the rear bottom. These silky smooth keys intertwine with the aluminium grille. It presents the appearance of keys floating evenly at the edge of a waterfall. The body of the Xkey is housed in a piece of moulded aluminium. The thickness is merely 3.6mm. Weighing around 600g the Xkey is even lighter than the iPad. With a slim and light form factor the Xkey can be stored in a standard size backpack. Xkey not only inherits the essence of the piano keyboard it also goes beyond the limits of traditional music keyboard design to meld ruggedness and lightweight mobile features perfectly together . The key layout of Xkey follows exactly the traditional piano octave range in accordance with a keyboard players finger memories and playing habits. An aluminium grille is used to clearly separate each key in order to ensure that the player can locate key positions while playing blind. The structure of each individual key is designed in such a way that the entire key moves down evenly when it is pressed at any point. Such design gives a unified sense of touch to the player. Under each key and button there is a customized pressure sensor connected to an intelligent circuit board with high processing power. The board processes performance data with very low power consumption. Such data include 128 level full velocity intensity and corresponding polyphonic after-touch control up to 16000 step pitch-bend control and real-time response speed manipulation. Features 25 full-size keys (2 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 Specifications Power Consumption: ~ 125mW / 25mA 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! Whats in the box? Xkey (25 keys) Micro USB cable User Manual 2 Years Warranty