Compact, waterproof, durable construction withstands tough work environments. LED has a 30,000 hour lifetime so it never needs replaced. Proprietary Micro Optical System (MOS) for optimized output (super bright beam) and run time. Shock proof, drop test verified above the industry of 6 feet. Unbreakable pocket clip and key ring for easy storage/attachment Stylus Pro LED penlight features up to 7.5 hours run time. An internal polymer body liner and shock proof switch housing allow for operation under the most extreme conditions. Also features an unbreakable polycarbonate lens and Type II MIL-SPEC abrasion and corrosion-resistant anodized aircraft aluminum. Includes (2) AAA alkaline batteries and a holster. 5.3" in length and weighs 1.64 oz. Limited lifetime warranty.