The Nite Ize Dawg LED Dog Collar is powered by a super-efficient LED bulb making it is a brilliant way to keep your dog safely visible to motorists and others during any night walk or early morning outing. Made of high quality nylon, this lightweight, durable collar houses a flexible, light-transmitting polymer core that illuminates when the collar is turned on. A reflective stripe adds additional safety. The Nite Dawg collar has two mode settings, flash and steady glow.  It is fully weather-resistant and visible up to 1,000 feet in the dark, and powered by a long-life, easily replaceable battery.  It is extra-effective when paired with the Nite Dawg LED Leash. Small fits: 10\" - 13\" 25.4cm - 33cmHigh visibility collar with bright red LEDLED Bulb (100,000 hours) Strong metal D-ring and quick release buckleGlow and flash modesVisible up to 1000 ft1x replaceable 2032 battery Battery run time: Glow: 75 hours Flash: 100 hours