How to use? 1.Clip the velcro strap onto the LED safety band make sure the plastic hook is facing up. 2.Insert the velcro strap into the other hole of the band and stick together to make a close loop. 3.Put it on your arm / leg and tighten it. You can adjust the length of the velcro strap to get better fitting. Helps improve visibility and safety. 72 hour continuous burn time / ultra bright LED / 96 hour flashing burn time / weather resistant; 2 Modes: steady / flashing