Sony VGC-LN2M User Manual page 67

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 Slightly push down the dented area (1), slide the battery cover in the direction of the arrow, and remove the cover.
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Using Your VAIO Computer