Sony VGC-LT10E User Manual page 25

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Getting Started
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You can check the battery indicator ( or ) in the LCD window on the wireless keyboard for its battery power level.
If the wireless keyboard does not operate properly, the batteries may need to be replaced. If the wireless keyboard is not being used for an extended
period of time, remove the batteries to avoid possible damage from battery leakage.
If you want to put the wireless keyboard in a more 'ergonomic' position, flip open the keyboard feet.