P16LM GREEN Portable 4-Functions Personal Safety Lights 16 LED Warning Safety Beacon Truck Trailer Boat Most Advanced, Rugged, Reliable and Versatile Warning Light Optional photocell to turn off in daylight and on at night Features 4 distinct patterns: Single Flash - Double Flash - Simulated Rotating - Steady Burn Weather resistant Battery operated 16-LED Personal Safety Light 2 "D" Batteries (NOT INCLUDED) 350-450 Hours