The ASP Sapphire is bright, reliable and conveniently clipped. The shock proof Sapphire will be come your constant companion. A lifetime of light... where and when you need it. The blue Sapphire Crystal produces a high efficiency, non-deteriorating, solid state beam. It provides soft illumination with a 180° viewing radius that is visible over one mile. This is a lighting system so advanced that it is guaranteed: A Crystal and Batteries for a lifetime of use.