P1RZ-IB-DFThe CombatLight that automatically adjusts to your lighting requirements Seamlessly shifts from 15 to 1,500 lumens, and everywhere in between Flexible Dual Fuel feature allows use of 18650 rechargeable or 123A primary battery power The P1RZ IB DF is a combat flashlight with a brain. The CombatGrip is designed and built specifically for tactical use in conjunction with a pistol, while the proprietary IntelliBeam technology automatically and seamlessly