You’ll be seen way better at night if you are wearing these lightweight self-illuminated markers. They are currently in use by military, police, fire, railroad and airport transportation personnel, where they’ve made low-visibility risky situations much safer. The long lasting LED embedded in the reflective can be set to flash or run constantly. Proven visible up to a mile away. Waistband Hook & loop waistband is adjustable from 39"–52". Yellow/Red. Runs up to 400 hours on two AA batteries (not included).