Features and Benefits: C4 LED technology, with a 50,000 hour lifetime Unbreakable and scratch resistant polycarbonate lens Up to 683 candelas peak beam intensity, 28 lumens typical, 2.25 hours runtime One AAA alkaline battery O-ring sealed, shock proof and drop-tested construction Streamlight 66318 MicroStream LED Pen Flashlight The MicroStream LED pen light features powerful LED technology Streamlight MicroStream LED Pen Flashlight.