Acer Extensa 4220 - Manual (Page 45)

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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.
1. Charging: The light shows amber when the battery is charging.
2. Fully charged: The light shows green when in AC mode.
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.
Battery Indicates the computer's battery status.
Bluetooth Indicates the status of Bluetooth communication.
Wireless LAN Indicates the status of wireless LAN communication.