DSI Modular Mac Mechanical Keyboard (Red Cherry MX) 90 full size keys featuring Red (non-tactile, non-clicky) Cherry Mechanical Key Switches 3 high speed USB 2.0 ports enable you to easily connect the modules to either the left side, right side or back of the keyboard Keyboard also comes with a separate AC adapter (100V to 240V) that plugs in to provide 500mA of continuous power N-Key Rollover Function: Pre-programmed to remember the last 16 keystrokes, so if you type really fast, nothing will be missed Comes complete with your favorite HotKeys, CD Eject and Volume control buttons, mute, and the Apple key