The Nite Ize Nitehowl Led Safety Necklace is made with a flexible polymer tube, illuminated by two bright LEDs, and 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. The LEDs can be set to either flash or glow modes - great for differentiating more than one NiteHowl-wearing dog. But, as fun as it is (like a neon necklace for dogs!), the best thing about the NiteHowl is that it keeps you and your buddy seriously safe on those after-hours walks, romps in the park, and campsite moon-howling sessions.