Fenix TK16-V2 A Tactical Powerhouse Boasting a 3,100 lumen output and significant 380 meter throw, the Fenix TK16-V2 will quickly become your preferred on-duty light before you know it. Using a dual tactical tail switch, single-handedly enter strobe mode or select one of 5 output modes including a 3,100 lumen turbo. New APF Technology The TK16-V2 utilizes Fenix's latest technology: the Advanced Pulse-frequency Transmission System. This new technology allows higher output and efficiency thanks to a mechanical structure that prevents interference. This also reduces the overall size of the light with a new single-layer transmission system as opposed to other lights that use multi-layer systems. 21700-Powered Powered by a single 21700 battery, the TK16-V2 has a max runtime of over 43 hours! The included 21700 has a built-in USB-C charging port. Recharge on-the-go without a battery charger - all you need is the cable and you're set! The battery itself has an LED indicator that'll instantly alert you when it's fully replenished.