I bought 4 of these lights to use on my jacket and to attach to dog harnesses for nightly walks.
Upon arrival one did not work. Jeffers promptly sent me a replacement (thank you Jeffers). The replacement only stays on if I hold the button down (does not stay on without pressure), a second light quit working entirely after about 10 minutes on our walk and a 3rd now only lights while the button is actively pressed down as well....
Great idea and size but completely unreliable.
I really liked this light. It is easy to turn on and off and easy to put on a collar and switch to a different collar if need be. However I found that it was also easy for my dog to accidently turn on if he laid his head on it. So I don't really know how long the batteries would have lasted if he hadn't been turning it on himself all the time. It was brighter than the other tag I had at the time, the flashing dog bone tag on this website. However it is not water resistant at all one day I was begining to give my dog a bath in the water hose and I forgot to take it off his collar first. I didn't soak it at all just splashed it some, but by the time I noticed and removed it it had already quite working. I never got it to work again but for $2.oo I think it was worth it.