[. . . ] Press the button on the bottom of the mouse to release the battery door. [. . . ] Make sure the receiver is plugged into a USB port on the computer and the computer is on. If cursor movement on your computer monitor is slow or intermittent around a wireless network, press the Reset button on the bottom of the mouse for 4 seconds. If none of the above has worked, use the Logitech Reconnection Utility (works only if the software has been installed). windows: Go to the Start Menu and select Start/Programs/Logitech/Mouse and Keyboard/Reconnection Utility. (If your PC has no touchpad, press the Start Menu key on your keyboard to open the Start Menu, and then use the Arrow keys to navigate this menu. ) Macintosh: Run the Logitech Reconnection Utility, follow the on-screen instructions, and click OK after the mouse becomes active. [. . . ] Your product comes with a 3-year limited warranty and is FCC and CE compliant. [. . . ]