Update #2 - back down to 1 star. They offered to send me a replacement, then never did. I have reached out by email multiple times with no response.
Update #1 - 1 star up to 4 - I reached out to the vendor, and they offered to send a replacement. Waiting on the mail for the new one to come out.
I really liked this collar, but today noticed that after about 6 months of use it was getting looser and looser - due to a broken clasp (plastic).