Lenovo IdeaCentre B510 User Manual page 7

Now the red light on the front end of the mouse keeps on constantly, which
indicates the connection of the mouse to the All-In-One PC is successful and the
mouse can work normally.
When the Bluetooth connection is established, you need not press again the
connect button on the mouse; otherwise the matching process will be re-
launched.
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Lenovo 3 in 1 Mouse User Manual
4. When the dialog "This
device has been successfully
added to this computer" is
displayed.
Click "Close" to finish the
matching.