. Taiwan R & D wafer， precise positioning. High resolution. USB cable plus up to 150 cm. Low-power laser light， moving more accurate interpretation. . Ergonomic shape and smooth， symmetrical design， left and right are applicable. . Can be used in all kinds of material surfaces， such as wood surfaces， office furniture， melamine board， skin and carpets. . USB plug and play， free install the driver. Use the vertical scroll wheel， makes it easy to browse the Web and read the file. System Requirements: Windows 7 / Vista / XP / 2000/98/95