Sony Vajo VGC-LT20 Series User Manual page 30

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Getting Started
7 Replace the back panel cover.
See Removing and Replacing the Back Panel Cover (page 20) for the procedure.
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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.