Abstract: A computer mouse and a method for warning a user to rest during operation are provided. The computer mouse includes a first timer and a warning device. A first predetermined period of time is set in the computer mouse. The first timer monitors a period of time when the user operates the computer mouse. The warning device is enabled when the operating period is longer than the first predetermined period of time. The warning device is disabled when the user stops operating the computer mouse.

Abstract: A positioning structure for a scanning article, applied in a scanning apparatus. The positioning structure has a hollow shell, at least one flexible and a positioning module. The hollow shell is disposed on a scanning platform and has at least one opening and projected portion formed thereon. The flexible element is used to prevent foreign objects or light from falling into the hollow shell. The positioning module is assembled with the hollow shell. Users can put the scanning article into the hollow shell through the opening, and then the scanning article is accurately positioned in a predetermined position for scanning by the positioning module.