Hybrid LED headlamp that can use both a dedicated rechargeable battery and AA batteries Brightness: 500lm, 250lm, 50lm with 3 light modes Illumination time: 8h (500lm), 12h (250lm), 21h (50lm) Power source: Lithium-ion rechargeable battery LE-ZP3730 or 4 AA batteries Includes an overhead band for wearing without a helmet If you need multiple units, please inquire via the question function (^.^)