BEAMSHOT BS8100S Handgun Weaponlight/150 Lumens Super Bright with New Strobe Function carrying case & Battery included) 150 Lumens/100 yards range Innovative quick attach/detach weapon rail mounting system; (patented) Powered by one CR123A battery (About 45 min; continuous use;)Single battery is easily changed by unscrewing the light head with no need to disassemble Light weight compact design makes weapon handling comfortable and natural Shock and water resistant