Pawow Adjustable LED Dog Muzzle, Keep Your Dog Visible & Safe, 5 Color, 3 Size Fits snout circumference 4.7"-6.3", for small dogs. Measure around snout near nostrils, under chin, over nose Made of mesh nylon with velcro tape closure, fully adjustable strap with quick-release buckle Prevents your dog from biting, barking and chewing things, great to prevent your pampered ones from chewing furnitures LED has 3 setting modes: steady mode, rapid flashing and slow flashing, light your dogs up at night, you can see him at long distances, also works well to alert drivers and other walkers, makes walking at night much more safer due to visibility of the lights, even long time using won't heat up Come with 2pcs 3V CR2032 button batteries, you will get about 80 hours of steady light, or over 100 hours of flashing light with each muzzle