Voltage-regulated (VR) light which delivers a constant level of illumination for the entire usable life of the batteries. Delivers constant illumination level for eight or more hours. User can select from two pre-set illumination levels to balance need for brightness vs. battery life. Helmet mounting permits hands-free operation. Light has a quick disconnect cord that separates the battery pack from the light shell. Efficient battery drainage reduces operating costs and increases burn time. Shell: 3 x 3 x 3-1/2, Battery: 4 x 2-3/8 x 2 ins.