1)Uses new surface technology: Can be used smoothly and accurately on glasses surface. 2)Strongly adaptability, can be used with or without pad. 3)Frequency conversion from 800DPI to 1600DPI makes one feels excellent when gaming. 4)The innovative technology avoids the bottom light, which secure the safty of eyes. 5)Alternative USB/PS2 port, compatible with Windows98, 2000, Me, XP, USB, PS/2, Vista, Macintosh, PC 6)Infrared 850mm design, lifecycle about 10million hours, comparing with traditionals, life longer. 7)Ergonomic design.