This battery-powered safety collar light is suited for attaching to the pet's collar as a pendant for those night walks. The light comes with a secure stainless steel spring clip that easily clips to the D-ring on your dog's collar. This flashing green light helps to keep track of the whereabouts of your pet by making it easier to see him or her. This can also can be used for key chains and to turn an ordinary dog toy into a flashing toy.