The Nite Ize NiteHowl LED Safety Necklace is made with a flexible polymer tube, illuminated by two bright LEDs (red) and simply slides over your dog's neck for hours of nighttime fun & safety. The tube and be cut to size and because it is a tube it allows for 360 degrees of visibility.The LEDs can be set to either flash or glow modes - great for differentiating more than one dog. Easily slides over your dog's neck as a bright LED addition to an existing collarGlow and flash modes360° of illuminationBattery run time: 60 hoursWeather resistant2x replaceable 1154 batteries (included)Universal sizing: cut to fit from 12" - 27" | 30.5cm -68.5cmWeight: 2.1oz | 59.5g