Sony VGC-LS20 - Manual (Page 31)

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Using Your VAIO Computer
4 Turn over the mouse, slide the power switch to the ON position, and press the CONNECT button.
Communication between the mouse and the computer should now be established.
!
Steps 3 and 4 must be completed within 10 seconds of each other.
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If the wireless mouse does not operate properly, the batteries may need to be replaced. If the wireless mouse is not being used for an extended period
of time, remove the batteries to avoid possible damage from battery leakage.