It marks your equipment so you can easily spot it in the dark! Charges quickly with sunlight or with artificial light source (lens, car headlights, etc.) Glows for up to 10 hours in the dark. No batteries, light bulbs or electricity - no maintenance required. The package contains a clip and a link for 2 Ni-Glo compound. Its dimensions are only 5 x 1.2 cm. It can be charged over and over again, whenever needed. Ready to use after just 10 minutes of exposure to light. You can hang it on anything you want to be visible in the dark. Color: Crystal Clear, Dragon Green, Orange Blaze, Panther Pink, Sour Lemon, Atomic Blue