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The wireless mouse that ships with the Lenovo IdeaCentre A540-24 All-In-One system is not Bluetooth compatible. There is a USB WiFi receiver in the battery compartment of the mouse. Remove the USB receiver from the mouse battery compartment, insert the USB receiver in a USB port on the computer, turn the mouse on and the mouse and wireless keyboard will connect to the same USB WiFi receiver. Be sure the mouse is turned on. If you have additional issues, we recommend you call Lenovo Tech Support at: 877-453-6686.
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