Sony PCV-V300G VAIO User Guide (primary manual) User Manual page 32

Insert two AA batteries (supplied) into the wireless mouse as shown. You can check your mouse's battery power level by
clicking (wireless mouse icon), located in the Windows taskbar notification area.
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Inserting batteries into the wireless m ouse
If your wireless mouse does not operate properly, the batteries may need to be replaced. When your wireless mouse
is not being used for extended periods of time, remove the batteries to avoid possible damage from battery leakage.
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