Impact resistant Engineering Polymer resin; The lens cover is made from the same impact resistant polymer as the body Lens: Unbreakable polycarbonate with scratch-resistant coating 1 watt super high flux Luxeon LED 10,000 hour LED life Four AA size alkaline batteries run time 4 hours continuous at full intensity; 2 additional hours of declining useable output 7 inches Streamlight Propolymer 4AA Luxeon Division 1 Flashlight, Black