4000Lumens & 316Meters Beam, powered by a single 21700 battery at massive 5000mAh, 2A USB Fast Charging, 200 hours long runtime, 7 lighting levels, Klarus classic tail dual-switch with tactical and outdoor settings to meet different requirements. The Very First 1 x 21700 Extreme Output Tactical Flashlight by Klarus, XT21X, is here now!