I read some other review about this product battery ... that they do not last that long ... but guess what ! I prove it wrong ... I buy this item like 4 week ago and still have enough power to light a whole 20x20 foot room . now I see why police officer love this tool , they can be use as self defense , and virtually undestructible ! there be no way than this flashlight can be destroy ... all my friend have make a comment about it . the bottom line be that this flashlight be really usefull . I be back editing my review !!! I have not still change the flshlight battery in 5 month !!!! it have cover all my expectation ... above everything ! no more comment ... it ; s undestructible ... I have take it everywhere and use it alot ... do not mess with a mag light !