Zebralight H32 CR123 Headlamp Cool White High: H1 480 Lm (PID, approx 1.4 hr) or H2 262 Lm (1.6 hrs) / 108 Lm (4.1 hrs) Medium: M1 54 Lm (11 hrs) or M2 24 Lm (26 hrs) / 9 Lm (70 hrs) Low: L1 2.7 Lm (8 days) or L2 0.4 Lm (38 days) / 0.05 Lm (2.5 months) / 0.01 Lm (3 months Beacon Strobe Mode: 0.2Hz Beacon at Low / 0.2Hz Beacon at H1 / 4Hz Strobe at H1 / 19Hz Strobe at H1 Battery: One CR123A or 3.6/3.7V 16340 li-ion rechargeable. Batteries are not included in the box.