Nite Ize SpotLit LED Dog Collar Light with Keychain Carabiner Clip - Bright White Night Light for Pets - Perfect for Night Walks, Hiking & Outdoor Adventures

Exactly what I hoped it would be. We have a 1 year old Chinook and a 9 month old Wolf who love to run around and play in our pasture at night. They play hard and rough with each other and these lights have held up perfectly.Since they’re puppies we really need to keep an eye on them and when they’re out running around in 5 acres of fenced pasture after dark when its cooler out it was impossible to tell where they were. We set one light red and one blue so we know which dog is which at night from a distance. 5 acres away and the lights are still bright and very visible. I know if I see the light stop moving by the fence line they’ve probably stopped to try digging under and can get right on top of the situation. Its also really fun to watch the lights zipping all around the field at high speed as they chase and roll around in the dark. I just clip it on where the leash would attach on the back of their harness. If you just clip it under the neck on a collar it isn’t nearly as visible unless they coming straight toward you.I was a little concerned about the mentions of battery life. I suppose if you just left it on all the time it’d be an issue, but we just use it about 1-2 hours each night and a month later we’re still on the original batteries and they’re still just as bright as the first day.I don’t remember if they claim these to be water proof or just water resistant, but fully submerged pond swimming hasn’t had any effect on them. The only complaint is from my wife, its too hard for her to squeeze them to turn on/off and over time it has seemed to get a little more difficult, but don’t get me wrong, we still love them.P.S.Ignore the review complaining theres no included instructions. The very simple instructions are printed right on the package. Its not like its a complicated device to begin with.