Red LED marker light visible up to 1 km with a flash mode lasting 120 Hours.The signal has an integral clip that allows it to be attached to any kind of belt, webbing loop or the elastic strap that it comes with. The elastic strap can be worn around the head, arm or leg or tied to something. A great product for runners, cyclists, walkers or anyone wishing to increase their visibility without impairing other people’s. One mountain rescue team has put one on every one of their members packs so they can be easily seem when dropped on the ground in the dark. I have applied this logic to my children so I can find them in the dark.