Sony VAIO VPCJ11 - Manual (Page 28)

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Using Your VAIO Computer >
Using the Keyboard
!
To maintain good communication, operate the wireless keyboard within the distance limitations of keyboard: approximately 33 feet (10 m) from your
computer.
Avoid using any wireless devices that exchange radio signals on the 2.4 GHz band near your wireless keyboard. These devices may create radio
interference, causing the keyboard to stop working properly.
Do not place metal furniture or objects near your computer or wireless keyboard, as this may create radio interference, causing the keyboard to stop
working properly.
Be sure to use an alkaline battery. Using an incompatible battery can damage the wireless keyboard.