They've got two "product lines" of remotes, Infrared Remotes and Hub-based Remotes.
My Harmony Elite is a Hub-based set with the hub and remote.
I think that some of the stand alone remotes have IR and BT capabilities, but I'm not sure.
Just noticed that their device compatibility* page says
"All Harmony products can control this device" about my
Wiim Mini, but Harmony still doesn't find any actions that it can do (I've set it up few weeks ago, I'll have to take a look again).
* I just happened to locate the
Harmony Integrations / Device Compatibility -page, so I'm leaving it here for me and anyone else to find.