Security! Competition crushing visibility of 350 yards. Be seen by traffic. Save your pet's life. You and your dog will be even more safe and visible. No matter where you go: you and your dog will be seen. Guaranteed.The USB rechargeable battery (cable included) gives 5 hours of illumination per 1-hour charge. A charge that will last multiple walks. No hassle with replacing batteries and no extra costs. On top of that, it's well-constructed and sturdily built. A durable design that will last a lifetime.