PetBoss LED Fashionable Flashing Pet Collar (Perfect for Morning and Night Walks-Safe and Waterproof), Medium, Blue/Red/Pink/Yellow/Green LED light glows and flashes in darkness Provide safety for your dogs and pets while it's out alone at night Easy to use: simply pushing the control button makes the light ON/FLASH/OFF Pet Bust Size: 15"-19" Width: 1"