The brilliantly durable and rechargeable NiteHowl LED Safety Necklace by Nite Ize is made with flexible polymer thats illuminated by bright LEDs and can be recharged for hours of nighttime 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 youll 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 thats 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.