The X400 Ultra features a high-intensity 5 mW red-laser sight (635nm) that is highly visible in daylight or even when surrounded by it"s intense 500-lumen, 13,000 candela white-light beam. The X400 Ultra can be attached to most railed pistols, to many rail-less pistols via available adapter mounts and to long guns fitted with a Picatinny rail. And, once mounted, it rarely need to be re-zeroed because it"s Nylok screws won"t back out. It can also be customized with optional handgun DG grip switches as well as remote switches for long gun use.