Here at Adventure Lights, we know pets are part of the family, and we want to help you keep them safe. The Guardian™ Dog Collar Light includes a velcro strap and belt clip, making it easy to attach to your dog’s collar, harness or leash. This light helps keep your canine friend visible to night-time drivers. Our patented Reverse Polarity Program Switching™ technology allows the function of the light to be changed between Flashing and Steady-On modes by simply flipping the battery over. Available in five output colors: Blue, Green, Red, White and Yellow EXTRAS: Comes with Belt Clip Comes with 8.5? Velcro Strap Battery duration Flashing ~240 Hours Steady ~100 Hours Duration may vary with temperature.