Sony VGC-LA1 User Manual page 53

Before you use the remote commander
Before using the remote commander, you need to insert the supplied AA manganese batteries to enable communication
between the computer and the remote commander.
To insert batteries
1 Turn the remote commander over.
2 Press in the tab (1) and lift the battery cover up.
3 Insert the supplied two AA batteries into the remote commander.
4 Align the battery cover to the remote commander.
5 Press down until the cover clicks into place.
If the remote commander does not operate properly, you may need to replace the batteries. When the remote commander has not been used for an
extended period of time, remove the batteries to avoid possible damage from battery leakage.
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Using Your VAIO Computer