The Nite Ize Nite Dawg Light-Up Collar is the answer to every night-loving dog owner?s problem: losing sight of their best buddy after sundown. Made of high quality nylon, this lightweight, durable collar houses a flexible, light-transmitting polymer core that illuminates when the collar is turned on. Powered by a super-efficient (100,000 hour) LED bulb, it?s literally a brilliant way to keep your dog safely visible?to you, to other people, to cars?during any late-day or early morning outing.Available in two colors and three sizes, the Nite Dawg collar has two mode settings, flash and steady glow. Fully weather-resistant, visible up to 1000 feet in the dark, and powered by a long-life, easily replaceable battery (included), it?s simply the best way to keep your dog?s presence clear and obvious, from dusk till dawn. (Extra-effective when paired with the Nite Dawg Leash.)Product Details:, Bright Orange LED, Glow and Flash Mode, 150 hour battery life, Replaceable Battery Included ? 1 x 2032 3v Lithium Coin Cell, Small: 10? ? 13? (25cm-33cm), Features a strong metal D-ring, quick release buckle and weather resistant push-button switch.