Acer Aspire 2020 - Manual (Page 19)

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# Item Description
1 Infrared port Interfaces with infrared devices (e.g.
infrared printer, IR-aware computer, etc...)
2 DC-in jack Connect the AC power adapter
3 Kensington lock slot For attaching a security device.
4 Ventilation slot Enables the computer to stay cool, even
after prolonged use.