LED Dog Safety Collar Flashing Light up, - Keep Your Friend Safe in Night Walks (Large (17.7~20.5 inch), Yellow) SAFETY - LED light glows and flashes in darkness to increases visibility up 1000 feet. Provide safety for your dogs & other pets while it's out alone at night. WEATHERPROOF - water-repellent, good for all weather conditions, it is lightweight, strong, durable FLEXIBLE USE  you can adjust the length of the collar by cut. Cleaning removable electronic parts. HIGH QUALITY & NEW DESIGN - adjustable length, easy to put on & use, comply for your dog, 3 mode selection (Steady glow, rapid flash, slow flash), with a quick-release buckle FASHION  The LED collar regardless of day or night are suitable for pet use when opening and closing the light-emitting function.