This LED light clips easily to either the 3 in 1 dog coat or your dog collar to make them instantly visible in the dark. Using high-brightness LED's, it can reach a visual distance of up to three kilometres in an outdoor dark environment. Includes a lithium battery can be easily charged with charging cable for use over and over again. Waterproof to a depth of 100 metres with high precision. Easily activate it with a click and save the batteries by turning it off the same way. Functions: steady-on, quick flashing, slow flashing.