The XT21X features a 4000 lumens max output, along with a dual tail switch and side switch, and a convenient yet speedy Micro-USB 2A for fast charging on the go. Choose between Tactical and Outdoor mode at your discretion – the 5000mAh, 21700 Lithium-ion battery’s long lasting runtime will make sure you’re always geared up wherever your adventure takes you. The Innovative ITS(Intelligent Temperature Protection System) monitors temperature and auto-adjusts output levels in real-time. You can even switch between 5 different lighting levels to optimise output for a longer runtime, and superior output distribution. Get lit!