Operates with single or double 6-Volt batteries (not included) installed. One piece battery compartment works with gravity for greater conductivity. Photocell circuit is designed to sense the ambient light levels. Inner L.E.D. light will be turned off if the current light conditions are too high. 90° lens for easy use on barricades and delineation devices. 7” polycarbonate lens. Standard Pack: 10. *Parts are not interchangeable with old incandescent light.