Sadly, I have no idea. I looked and there's no labeling at all -- just a black "thingy" -- I'm pretty sure it came with the software package I purchased.
Just an update on my original issue: My Vantage VUE ISS died (at least the temp/hum probe did). I could not find a replacement part so based on excellent recommendations here, I purchased the Davis 6323 Wireless Pro2 ISS and paired it with my Vantage VUE console. Thank you, Ryan, of Scaled Instruments!
First impression: The Pro2 is a beast compared to the Vantage VUE ISS. Clearly a significant step up. It's probably more system than I need as a slack hobbyist -- but, I decided (with the nudge of a fellow forum member) to move up to a fully aspirated system since I live in FL where it can be brutal in the summer.
Again, thanks to each of you for helpful replies.
-gene