Zebralight H52 Headlamp Cool White - 300 Lumens - use AA battery High: H1 300 Lm (0.9 hrs) or H2 184 Lm (1.7 hrs) / 116 Lm (3 hrs) Medium: M1 54 Lm (7.5 hrs) or M2 27 Lm (12 hrs) / 13 Lm (27 hrs) Low: L1 2.9 Lm (4 days) or L2 0.36 Lm (3 weeks) / 0.06 Lm (2 months) / 0.01 Lm (3 months) Beacon Strobe Mode: 4Hz Strobe at H1 / 19Hz Strobe at H1 Battery: One 1.5V AA (NiMH, lithium or alkaline) or 3.7V 14500 li-ion rechargeable. Batteries are not included in the package.