Bright RED LED - Flash or glow modes.  Flexible, light polymer core surrounded by strong nylon webbing.  5 feet long - glowing polymer extends 18" down from switch.  Strong rotation spring clip.  Weather resistant (enclosed switch).  Visible up to 1000 feet in the dark.  150 hour replaceable battery-included -100,000 hour LED life.  Dog owners love these leashes because walks at night are a lot safer and more fun.  You can see your dog wherever they go and keep track of them. We recommend these to all people with dogs!!