[. . . ] TM 1600 dpi Laser Mouse Manual Quick Installation Guide IR-7521L 1600 dpi Laser Mouse 1 Welcome Congratulations on your purchase of an I-ROCKS IR-7521L Laser mouse. [. . . ] Although this mouse is a Class 1 laser product and safe for operation, avoid pointing the laser into the eyes or looking directly into the laser emitter. Any attempt to disassemble, adjust or repair the mouse may result in exposure to laser light or other safety hazards. 1600 dpi Laser Mouse 5 Troubleshooting I do not see the laser light when the mouse is active. Unlike traditional optical mice, the light is not visible when the laser mouse is active. To make sure the mouse is on and functioning properly, move the mouse back and forth and check to see if the cursor responds. Thought rated for most of these kinds of surfaces, occasionally there will be one such surface that will cause the mouse to work improperly or not at all. If you are using the mouse on a reflective or mirrored surface, move it to another surface 1600 dpi Laser Mouse 6 Important Ergonomic Information Research suggests that physical discomfort and injury to nerves, tendons, and muscles may be related to repetitive motion, and improperly set up work area, incorrect body posture, and poor work habits. [. . . ] Macintosh® Mac® OS X 10. 1~later USB version 1. 1 interface TM All product names are trademarks or registered trademarks of their respective owners ® ® ® Microsoft , Windows and Windows logo are trademarks or registered trademarks of Microsoft Microsoft Corporation in the United Stated and /or other countries. ® ® IR-7521L-M00027-V01 [. . . ]