Sony VGC-RC300 - Manual (Page 37)

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Using Your VAIO Computer
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You can check the battery power level for the mouse by clicking (wireless mouse icon) on the taskbar.
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.
Adjusting the Mouse Functions
1 Click Start and then Control Panel.
2 Click Printers and Other Hardware.
3 Click Mouse.
The Mouse Properties window appears.
4 Change the settings.