Lenovo IdeaCentre B510 User Manual page 32

The best angle to use the remote control is within 30°.
30
Make sure there are no physical obstacles between the remote control and the
computer that could block the Bluetooth connection.
Note:
Bluetooth LED solid:
Indicates a normal Bluetooth connection to the computer. Otherwise, this indicates
disconnection or that the remote control is in sleep mode.
M LED solid:
Indicates that the CD game is active and can be manipulated by the remote control.
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User Guide