The Streamlight Polytac LED Black has C4 LED technology with a 50,000 hour lifetime. It features a borofloat glass lens and an o-ring sealed. The tail cap push button provides one handed momentary or constant "on". There are 3 hours of continuous runtime to the 10-percent output level. C4 LED technology, impervious to shock with a 50,000 hour lifetime borofloat glass lens, o-ring sealed tail cap push button provides one handed momentary or constant 'on" 3 hours of continuous runtime to the 10 percent output level two 3 volt CR123A lithiumbatteries with a shelf life of 10-year
