Genius 2.4 GHz 1600dpi Laser Mouse for glass surface (Traveler 9010LS) 2.4GHz 4-button wireless laser mouse Precision 1600 dpi laser engine Powerful laser tracking works on clear glass surfaces Double injection grip gives you extra comfort Contoured shape is suitable for either hand Instant dpi switch between 800, 1200 and 1600 dpi Convenient battery compartment design for AA or AAA battery