[. . . ] WARNING: Do not shine the optical sensor located on the bottom of the mouse into your eyes!If you feel any pain, discomfort, numbness, tingling, aching, cramping, stiffness or swelling in your hands, wrists, arms, shoulders, neck, back, or fingers, you should stop using your computer mouse and seek the advice of a qualified health professional. [. . . ] And because there are no moving parts, there is nothing to clean or adjust. It is strongly recommended that you read the following instructions to find all the necessary information regarding the functions of the mouse. Please take note of all the enclosed instructions and safety precautions. The red LED located under the device will light up to indicate that your mouse is ready for use. Your mouse comes with a retractable cable to organize unsightly cord and self adjust the cable length. Make sure that the mouse connector is firmly plugged into the mouse-only USB port at the back of the laptop. Mal-function or loss of memory may be caused by strong frequency interference or electrostatic discharge. Should any abnormal function occurs, unplug the mouse then plug it back. Make sure you are not using your mouse on a transparent surface like glass or a reflective surface like a mirror. Try using a traditional mouse pad or use the mouse on a different surface. [. . . ] Please actively support the conservation of resources and help protect the environment by returning this appliance to a collection centre (if available). O cursor no ecrã não se move correctamente, ou não se move absolutamente nada. [. . . ]