ELD 150 MILES EXEMPTION

Most likely because you were not completely logged out of the application. The transponder will still recognize driving events and if you're still logged into the application, it will record the events. Otherwise, (if you were indeed logged out of the application) the transponder recorded "unidentified driving" events while you weren't logged-in and you accepted the events as your own.

 

What brand?

 

The only way(s) the information would be recorded to the application, would be if you were still logged in. Or, you accepted the unidentified driving event (which can also be assigned, through the administrative portal).
However, from the sound of it... You should be using "Personal Conveyance", while making this trip anyway.

 

Confused on the ELD rule? FMCSA official tries to clear it up

 

Translation: You log-in every day. Utilize the Exception that is provided by the application. And... have the proper documentation, that you (legally) fall under that exception. Just turning it off, isn't going to cut it (when an Officer is inspecting). Then you remove the exception, when you travel outside of the 150.
Otherwise, have fun explaining "how your Odometer went from 137,465 to 137,797" with no record. He's not going to "take your word for it."

I'm not beating you up here. I work for a completely different company. But, I see far too often that the devices/applications aren't being used correctly, leading to even more frustrations, log edits and eventually fines and OOS. I don't want that to happen to you guys.