Acer Extensa 3100 - Manual (Page 27)

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Indicators
The computer has three easy-to-read status indicators on the left side of the
keyboard, and four on the front panel.
The power, battery and wireless communication status indicators are visible
even when the LCD display is closed.
Icon Function Description
Caps Lock Lights up when Caps Lock is activated.
Num Lock Lights up when Num Lock is activated.
HDD Indicates when the hard disk drive is active.
Battery Lights up when the battery is being charged.
Power Lights up when the computer is on.
Bluetooth Indicates the status of Bluetooth communication.
Wireless LAN Indicates the status of wireless LAN communication.