This light is fab, lives on the collar of my springer and faces all manner of challenges. The light has been regularly submerged in rivers, bogs, puddles, snow and mud, and dragged through all manner of bushes yet still works flawlessly. The first one survived a year until her collar broke and we lost it in a bush. It’s a small but powerful light that means we can keep track of her in a forest in the dark. The button can be a tad fiddly, but still manageable just takes a couple of attempts in gloves.