I got a pair of these for my mutts about 3 months ago. I use them when I send the dogs out into the yard at night in case they encounter some wildlife and I need to go “rescue” them. It also gives people passing by a bit of a heads up that they are there.
I’m pretty happy with them in general, but one of the two has already had the batteries (2x watch size) die after maybe a couple of dozen uses. It may be an anomaly, since the other one is still going strong on the original batteries.