Constructed of aluminum alloy Sutra LED technology high performance Powered by a high capacity Lithium Iron Phosphate rechargeable battery The flashlight provides momentary, constant-on operation, high, power-saving, and a strobe output modes. While the high output mode delivers 533 lumens for 2.5 hours, the power saving mode delivers less light but extends operating time to 4.0 hours. To activate the flashlight and switch between the modes, use the tailcap pushbutton. The Quick-Click switching allows changing between output mode.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }