Blue LED Sensor - Blue LED outperforms both optical and laser mice. The combination of a large beam with image sensors and pixel geometry allows the mouse to track accurately on almost any surface. Less Clicking Sound Model - Convenient when you at the library or the office where people are around you. Back Button - It comes with 4 physical buttons on the device, includes BACK BUTTON which is convenient for web browsing. Symmetrical Design - A design can be used without worrying about the dominant hand. Support Right/Left handed users Presentation Mode - ELECOM Mouse Assistant Software can be easy to customize button functions that include PRESENTATION SLIDES CONTROL BUTTONS. ELECOM Mouse Assistant Software will be available to download from ELECOM NET website.