Acer Aspire 5540 - Manual (Page 45)

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Indicators
The computer has seven easy-to-read status indicators, including four on the
front panel.
The power, battery, Bluetooth and wireless communication status indicators are
visible even when the LCD display is closed.
Icon Function Description
HDD Indicates when the hard disk drive is active.
Num Lock Lights up when Num Lock is activated.
Caps Lock Lights up when Caps Lock is activated.
Power Indicates the computer's power status.