The OKW V2 Modlite Single Mode head is compatible with Modlite 18650 and 18350 bodies, and other similar Dual Fuel style bodies on the market.These OKW V2 heads are best suited for use on a Handheld light. SINGLE Mode heads feature HIGH-Only output.Runtime with 18650:High Mode will have a 75 minute runtime and is the default configuration the light will ship with.Runtime with 18350:High Mode will have a 35 minute runtime and is the default configuration the light will ship with. FeaturesDrivers are fully potted and tested.6061 Series Alum bezel with Mil-Spec Hard AnodizingUltra clear BOROFLOAT lens allows 98-99% light transmittance