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1 USB host connector (connects to USB devices such as flash drives) (HP Officejet Pro K550dtwn)
2 Network connector (HP Officejet Pro K550dtn/K550dtwn)
3 USB connector
4 Power input
5 Rear access panel (HP Officejet Pro K550)
6 Optional automatic two-sided printing accessory (duplex unit) (HP Officejet Pro K550dtn/K550dtwn)
ENWW Understanding the printer parts 7