This is a light head that is perfect for your next build or upgrading a current light system. They recommend single-mode for any weapon-mounted light, and multi-mode for handhelds.Single-mode will feature one high-only output, while multi-mode will default to high and have a programmable low/admin mode (15% of high output). FeaturesMulti-Mode.Dual Fuel (Rechargeable 18350, 18650) or 2x CR123s.Cool White 5700K emitter tint.Made and assembled in the USA.Drivers are fully potted and tested to withstand select fire SCAR 17 recoil.Lifetime transferrable warranty.6061 Series Alum bezel with Mil-Spec Hard Anodizing.Ultra clear BOROFLOAT lens allows 98-99% light transmittance.