Zebralight H602 Cool White LED Headlamp 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 Builtin over-discharging protection (2.7V cutoff) Smart user interface provides fast and easy access to all brightness levels and beacon-strobes.