Features 73-key (6 octaves, E-E) Velocity sensitive Hammer Action Portable keyboard Nord C2D B3 tone wheel simulation Improved Key Click and Percussion 122 Rotary Speaker simulation Vox and Farfisa organ simulations Description Product Description Includes 1 Year Free Extended Warranty. The Nord Electro 4 series feature everything from the award winning Electro 3 series, adding the acclaimed Nord C2D tone wheel engine and 122 Rotary Speaker simulation, USB MIDI and more! Main Features Three models Nord C2D B3 tone wheel simulation Improved Key Click and Percussion 122 Rotary Speaker simulation Vox and Farfisa organ simulations Nord Piano Library compatible String Resonance (Gen 1) Long Release Nord Sample Library compatible Powerful Effect section 4 Live Locations/Program Banks Extended Control Pedal Support USB MIDI. No driver required for Mac OS X, a WHQL certified driver is available for Windows. 2X Memory for Nord Sound Libraries (Electro 4 SW73/HP Only)