“What are the little yellow and grey plugins at the back of the printer used for?”

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• The printer has ports in the back of the printer. Here are the ports that are back there: 1 USB 2.0 1 Wi-Fi 802.11b/g/n 1 Ethernet 1 RJ-11 (Fax) You can remove the plugins to use the ports. I hope this helps.

  Answered by HP Team 9 years ago

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• Grey one is used for faxing.The Yellow one is the Ethernet port.

  Answered by Ray32 9 years ago

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