Back Panel - Dell Inspiron 3668 Setup And Specifications

6 Security-cable slot
Connect a security cable to prevent unauthorized movement of your computer.
7 Service Tag label
The Service Tag is a unique alphanumeric identifier that enables Dell service
technicians to identify the hardware components in your computer and access
warranty information.

Back panel

1 Line-in port
Connect recording or playback devices such as a microphone or CD player.
2 Line-out port
Connect speakers.
3 Microphone port
Connect an external microphone to provide sound input.
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