Expand your HP Engage One Prime with the HP Engage One Prime I/O Hub that fits neatly under the stand or the counter. Connect to a range of accessories with legacy and evolving ports: 2 Serial (db9), 4 USB 2.0, 1 USB A (powered 12v), 1 Gigabit Ethernet, 1 Cash Drawer port, and 2 USB Type-C™.