* The HC5 Pro comes with a USB dongle, presumably a pre-paired bluetooth adapter.
* The non-Pro HC5 can simultaneously connect to two bluetooth hosts, and the HC5 Pro cannot.
* The HC5 Pro has a charging stand (which is of no use to me).
Both have dual microphones.
Both support CVC 8.0 noise reduction (to quiet background noise for the
benefit of the person you're talking to on the phone)