[. . . ] ) Push forward to close the battery compartment back onto the mouse again until you hear it click into place. [. . . ] â· If necessary, use the three-inch extension cable to keep the receiver away from the computer. Metals, such as iron, aluminum or copper, shield the radio frequency transmission and may slow down the mouse's response time or cause the mouse to fail temporarily. â· If your computer has a metal case that contains aluminum or magnesium, use the mouse to the side. The display panel may interfere with the radio frequency signal if you use the mouse directly in front of the computer. â· Never use the mouse on a glass or mirrored surface as these surfaces will cause the mouse to fail temporarily. â· To maximize battery life, use the mouse on a white, or light colored surface. Dark surfaces cause the mouse's light emitter diode (LED) light to glow brighter, which causes the battery to discharge more rapidly. Disclaimer: Information in this document is subject to change without notice. [. . . ] Please use the return and collection systems available in your country for the disposal. [. . . ]