» 75 Hour Replaceable Batteries - Long-lasting batteries that are easily replaceable. » High Visibility - Ultra Bright L.E.D. lights that make your dog visible up to 200 yards away. » 3 Light Modes - Switch between a slow flash, fast flash, and constant light mode. » Super Adjustable - Easily tighten or loosen the collar. » Top-Quality Design & Materials - Our L.E.D. Collars are pull-tested and will not hurt your dog when they pull hard. The collar is durable too.