Sony VGC-RA204 Hardware Manual page 28

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Hardware Guide Using your VAIO computer
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Steps 5 and 6 must be carried out within 10 seconds of each other.
If your wireless mouse does not operate properly, the batteries may need to be replaced. If your wireless mouse is not being used
for an extended period of time, remove the batteries to avoid possible damage from battery leakage.
Always make sure to use the same type of batteries. Do not use new and old batteries at the same time.