HP iPAQ Pocket PC h5400 Series Reference Manual page 25

6. Insert the AC Adapter plug into an electrical outlet. Connect
the AC connector to the universal cradle.
7. Connect either the (a) serial or the (b) USB connector on the
universal cradle to the port on the back or front of your
personal computer.
Use either the serial or the USB connector. Do not connect both
connectors at the same time.
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