Sony VGC-RA204 Hardware Manual page 22

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Hardware Guide Using your VAIO computer
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If your wireless keyboard does not operate properly, the batteries may need to be replaced. If your wireless keyboard is not being used for extended periods 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.
If you want to put the keyboard in a more 'ergonomical' position, open the keyboard feet.