Sony VGN-FE890N - Manual (Page 64)

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Using Your VAIO Computer
Before you use the remote commander
Before using the remote commander, you need to insert the supplied AA manganese batteries and connect the remote sensor
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.