Dell 3555 security cable slot, cooling vents, network connector, HDMI connector, e-SATA connector

Figure 6. Vostro 3550/3555 — Back View
1.	security cable slot	8.	cooling vents
2.	network connector	9.	HDMI connector
3.	USB 3.0 connector	10.	e-SATA connector
4.	battery	11.	8-in-1 memory card reader

5.VGA connector

6.AC adapter connector

7.USB 2.0 connector (Vostro 3550) / USB 3.0 connector (Vostro 3555)

WARNING: Do not block, push objects into, or allow dust to accumulate in the air vents. Do not store your Dell computer in a low-airflow environment, such as a closed briefcase, while it is running. Restricting the airflow can damage the computer or cause a fire. The computer turns on the fan when the computer gets hot. Fan noise is normal and does not indicate a problem with the fan or the computer.

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