Silver Moons and Stars on Dark Green Cat CollarA note about any of our glow in the dark products: This item features glow in the dark pigments. It does not contain any electronic elements or batteries. The pigments require exposure to a light source in order to activate. Either indoor lighting or sunlight are effective at activating these pigments. If you live in a home that is often dark and doesn't have any sunny windows the collar may not receive enough light to glow. If you have a very long