Energizer Hard Case Tactical Second Generation helmet light provides four light modes: Bright White-high intensity, Blue LED for light-discipline and medical applications, Infrared light for use with night-vision devices, and IR strobe for Identify Friend or Foe (IFF) capability. IR and Lockout modes prevent other light sources from operating. Light can be rotated in 18-degree increments and locked into place. Five hours of runtime on bright white, high mode when powered by Energizer Ultimate Lithium batteries. Smart Switch Technology controls intensity of all visible light sources and provides "quick-extinguish" feature.