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The Puplight is like a flashlight for your dog. The light includes an elastic band which you can hang the light from, or you can attach it directly to your dog's collar. The light housing is made of plastic and also includes a hinged piece which allows you to adjust where the light is pointing (up and down.) The Puplight is useful for night time walking in dark areas. This is the only pet safety light I have seen on the market which actually projects light like a flashlight, which allows the Puplight to help light your path as well as making your dog more visible to others at night. As a safety tool to make your dog more visible, this light works better than the other collar lights I have seen. Most collar lights for dogs do not give off much light, so if the actual lightbulb is blocked by your dog's fur or if a car or person is on the wrong side of your dog and the dog blocks the lightbulb, little or no light shines through. The Puplight claims to illuminate up to 200 feet in front of the dog, which provides a great deal more visibility than other safety lights for dogs.
The Puplight also works fairly well as a flashlight to illuminate your path. One benefit I have found is that if your dog sniffs something on the ground, the Puplight will show you exactly what it is, which can help you prevent your dog from eating unknown objects.
The only problems I have had with the Puplight was with one of my dogs, a Golden Retriever. She would tend to walk with her head lowered much of the time, and that would block a lot of the light from the Puplight. I tried various configurations to allow the light through but she still blocked a lot of it. If you have a hound breed or a dog who likes to sniff a lot, this could be an issue. This problem causes the light to be less useful in illuminating the path in front of us, but does not affect the usefulness as a safety/visibility tool.