Rogz RogLites are 2-in-1 luminous lights that glow or flash continuously for high visibility in darkness or fog. Hang or attach it to your dog's collar, leash or harness, or attach it to yourself or a bike. This dog light has two settings: flickering or constant, and is water-resistant and fully submersible. For more than one dog, different colors mean that each dog can wear a different color for easy identification.