Zebralight SC600w Mk II L2 18650 XM-L2 Neutral White Flashlight PID thermal regulated outputs (1020Lm and 620Lm) Battery capacity indicator (LED flashes 1-4 times, 4 short clicks to start) Automatic stepping down from High to Medium, and from Medium to Low when battery capacity is low Smart user interface provides fast and easy access to all brightness levels and beacon-strobes Proprietary heat sinking design bonds the LED board directly to the unibody aluminum casing