The brilliantly durable and rechargeable NiteHowl LED Safety Necklace by Nite Ize is made with flexible polymer that's illuminated by bright LEDs and can be recharged for hours of night-time fun and safety. With Disc-O Select, this NiteHowl makes identifying multiple dogs easy with the ability to choose from one of three selectable colors (red, green, blue), plus a unique Disc-O mode that you'll have to see to believe. By illuminating the polymer with multiple colors at the same time, Disc-O mode creates a flowing color-blending pattern that's as fun as it is functional. To use the NiteHowl, simply trim the flexible polymer 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. Dimensions: cut to fit from 12" - 27" L x 0.82" D