This safety collar is used together with your dog's regular dog collar. After you have activated it, a moving light starts moving around the collar. The Trixie Light Band can be easily put around your dog's neck & it will contribute to your dog's safety in the dusk & dark hours: he'll be visible from a distance. Please note: The Trixie Light Band shouldn't be used as an everyday collar. It is a supplement to the usual collar of your pet & should be used only as such! What's this?