[. . . ] Use of 256 ID codes to prevent interference between several wireless mice being used simultaneously 3. [. . . ] The mouse can use the supplied USB cable to charge the batteries through the computer USB port. Please note that the time of charge may vary depending on the amount of charging required. Figure 5 Note: 1. Please remove the batteries if the mouse will not be used for an extended period of time 2. If the mouse has entered power sleep mode please press any mouse button or move the mouse to make it active again 3. To turn the mouse power off click on the ID button on the underside of the mouse for over 3 seconds until the light turns off 4. Optical mouse will not operate correctly on any reflecting surface such as glass or 3D mouse pads Caution Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. [. . . ] Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. [. . . ]