Specification: Emitter: Three LEDs on a copper DTP MCPCB e.g. Cree XHP50.2 LED Optic: Aluminum Orange Peel Reflector Flux: 10000 lm Intensity: 26055cd ANSI throw 325 meters(XPL HI) Fireware: The FW21 PRO uses free software called Anduril, Distributed under the terms of the GPL V3. Code is available from http://tiny.cc/TKAnduril User Inerfaces: a. By default the FW21 PRO is set to use SMOOTH RAMPING. Instant access to TURBO mode is also provide . b. A more conventional STEPPED RAMPING UI is available if you like discrete modes level. You can choose how many steps you want. c. Momentary mode is useful for signaling purposes or rapidly/briefly lighting up targets. To exit this mode, physically disconnect power. d. Muggle mode uses a reduced output e. It has an electronic FOR Safety . Other functions: Battery check . sunset. Beacon. Tactical strobe, party strobe, bike flasher, candlelight. Lightning storm. Battery: One flat-top or button-top 21700 cell. An unprotected cell is recommended . Max Length 70.5mm Cell is not included. Driver: FET+7+1 Driver. Low parasitic drain while OFF. Meterial: Aluminum with hard-coat anodizing. Switch: Electronic tail switch Ingress rating: Equivalent to IPX8 Weight: Approximately 120g without cells. Size: 40mm(head) x 102mm length(length) x 28mm (tube) For future specification and operations, please read the user manual . Packing List: 1*Lumintop FW21 PRO Flashlight 2*Sparing O-ring