ThruNite Neutron2C V2 CW Handheld LED Flashlight Max 1040 Lumen With Extension Tube Max output 1040 lumen with 1 x 18650 battery with extension tube Adopted Cree XM-L2 (U2) LED with life span of 50,000 hrs levels of brightness: Low, Mid and High & 2 special modes: Firefly and Turbo mode High efficient drive circuit with military grade IC and electronic component to ensure high output, 25.4mm diameter head well combined heat dissipation with throw. Memory functiontosetanymode(exceptforfirefly,turbo)forimmediateuse.