Acer Extensa 4210 - Manual (Page 43)

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Indicators
The computer has serveral easy-to-read status indicators:
The front panel indicators are visible even when the computer cover is closed
up.
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.
Bluetooth Indicates the status of Bluetooth communication.
Wireless LAN Indicates the status of wireless LAN communication.
Power Indicates the computer's power status.
Battery Indicates the computer's batttery status.