If your dog has this dog night light on it’s collar or harness, it will allow drivers, cyclists, joggers & others to easily see your puppy from far distances, be safe at night. There is a small power switch button, features three modes: solid, fast flashing, and slow flashing.. The LED lights dog collar light is not only suitable for pets, but also can be used when people are running at night, riding a bicycle or camping outdoors, and can also be used as a keychain or decoration. The light can emit a soft and long-lasting light for night walking, running, or any other night activities.