1. Utilizing the newest Cree XM-L LED, the highest output reaches 550 lumens 2. Moonlight, Low, Medium, and High four adjustable brightness levels, with another 2 types of strobe, namely fixed frequency strobe & frequency conversion strobe. 3. The moonlight mode & the high level output can be accessed directly when the flashlight is off 4. OLIGHT patented lock-out function 5. With a strong removable magnet in the end of tail, the flashlight can absorb vertically on any ferrous object. 6. With a removable long pocket clip 7. Stainless steel head ring can bear higher tensile impaction 8. High efficiency driver circuit, perfectly support 2xCR123A & 1x18650 9. Spring contact structure (on both the 2 poles) is adopted to enhance the ability of anti-vibration 10. Low voltage indication: the bottom side switch will shine in red, when the power is low.