Light Up Dog Safety Collars This brilliantly durable Nite Howl LED Safety Necklace is made with a flexible polymer tube, illuminated by two bright red LEDs, that simply slides over your dog's neck for hours of nighttime fun safety. Just trim the tube to a custom fit, give the button on the durable, weather resistant housing a quick press, and the entire collar lights up a full 360 degrees, making your dog clearly visible from all angles, coming and going. The LEDs can be set to either flash or glow modes. Two bright LEDs. Easily slides over your dog's neck as a bright LED addition to an existing collar. Universal sizing: cut to fit from 12" - 27" (30.5cm -68.5cm). Glow and flash modes. 360 degrees of illumination. Battery run time: 60 hours. Weather resistant. Replaceable batteries (included) Choose color: Red, Pink, Blue, or Green