Unrecognized Authorized Client Devices

I have a list of Authorized Client Devices with 7 entries. The first four are legitimate (cell phone, home computer, work computer, ring.com). The last three entries are questionable and I'm not sure if they're from tech support accessing the devices, or something that is just always there. They are: ring\_official\_windows/xx-xx-xx-xx-x (where x = identifying letters and numbers) ring\_official\_windows/xx-xx-xx-xx-x (where x = identifying letters and numbers) unirest-java/1.3.11The ring\_offical\_windows entries are in addition to the home/work computer entries I mentioned above, which identify the the computer by the user name. The other known devices (except ring.com browser device) have "Authorized on" dates, whereas the others just say "unknown". I have not shared any user or login information with anyone, including Ring tech support. What do these unknown entries mean? Why can't I remove them (it appears removing access for all devices is the only option). Thanks