Nightstick FDL-300R-K01: This compact polymer tactical fire light uses a Cree LED rated at 180 lumens that works in conjunction with a high-efficiency deep parabolic reflector to create a usable beam rated at 190 meters. The tail-cap switch provides momentary or constant-on functionality. The 1 handle diameter allows it to be pared with most 3rd party helmet mounts for use by Fire and Emergency personnel. Power comes from a pair of included CR123 Lithium batteries.