The Bayco NIGHTSTICK Tactical Flashlight (Black) uses the industries finest LED technology, CREE LED. It provides 180 lumens, a run-time of 3 hours and recharges in 6 hours. It is constructed from xenoy polymer it is impact resistant, chemical resistant and waterproof to 1 meter. Its 50000 lamp life means you won't ever need to concern yourself with replacement bulbs. The lithium ion battery pack is the reason this tactical flashlight remains so compact.