Enhance the safety of your pet and yourself with this collar that illuminates his location inside and out. The collar contains a high-tech phosphorescent glow pigment that is charged by indoor or outdoor light and never wears out. It glows all night after a short exposure to light and will charge while on your pet. The FurEver Brite collar is flexible, stretchy and gentle on your pet's throat. Waterproof too. Includes a free ID tag. Suitable for use on all types of animals including horses (snap two medium collars together), cats, llamas and livestock.