The HellFighter LightStorm X-21 with a 2.5 inch head offers outputs to 500 lumens and is available in both standard 12 and 9 volt lithium battery versions and new 4500mAh rechargeable systems with run times approaching nearly two hours! Waterproof, Shock Isolated, MilSpec, also available in IR versions. Length: 10" Width Head: 2.25" Width Body: 30MM Material: Mil Std 6061 511 T6 Aircraft Aluminum Alloy, Body functions as heat sink. Lamp: Xenon/Halogen/Argon High Intensity vapor-sealed, incandescent High Temperature Filament Bulb. Wattage: 6.5 watts Voltage: 12 Volts Nominal, 7.2 volts in rechargeable mode. Output: 500 Lumens/450 Lumens Rechargeable Runtime: To 1 hour, dependent on battery performance. 3 hour on LED and rechargeable Lamp Mounting: Permanent Soldered, Spring Isolated Shock resistant on tool axis to 1250G. Lens: Optical Grade Borosilicate Glass, Iridium coated for 5500k daylight equivalent beam. Reflector: Parabolic Shaped silver halide coated over etch-stippled finish to eliminate filament ring shadows. Remote Switch (optional accessory): Pressure pad, waterproof 6 inch cable, replaces tail cap. Power source: (4) 123 series Lithium Batteries Rechargeable,(2)3.7 volt 2400MA batteries.