Poor beam , not even and weak . twist to open\/off . seem difficult to turn it on\/off with one hand . I do not think in a emergency everybody can have both hand to turn this flash on . when you get a focused beam then the head can pop off to become a candle light . I do not like this idea . high price , low run time . different color get different price . ridiculous ! I want to use it to to light up the laser marked chip . it do the job poorly even my $ 1 cheap flash from Fry 's can light up the laser mark for I to read . I be really disappointed and do not know how to deal with it . Ben