Asp Navigator lights resembles the Sapphire light in all respects, except that it has a red crystal. The Sapphire is bright, reliable and conveniently clipped. The Sapphire will become your constant companion. A Lifetime of Light-where and when you need it. The red Sapphire Crystal produces a high efficiency, non-deteriorating solid state beam. It provides soft illumination with a 180 degree viewing over one mile. This is a lighting system so advanced that it is guarantee. A Crystal and Batteries for a lifetime of use.