Sony VGX-TP1 - Manual (Page 28)

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Using Your VAIO Computer
To connect the wireless keyboard
!
To connect your wireless keyboard, it must be located within a range of approximately 11 inches (30 cm) to 40 inches (1 m) from the computer.
1 Turn over the wireless keyboard.
2 Press the button (1) on the battery compartment cover and slide and lift the cover in the direction of the arrow to remove
the cover.