Let me explain the 5 stars...I have toyed with the idea of a light on the end of a handgun for years, but never could pull the trigger because they just seemed impractical for me (sorry for all the puns). This light was cheap enough to give it a try. I love it because it affirmed my original thoughts of "that's just a silly, tactical, movie prop". For me the light is useless, and I took it off after three minutes. Now for the light itself. It actually worked very well. It comes with two switches: one "remote" pressure switch for your hand and another "on/off" button on the back.; these are separate and interchangeable. Both worked just fine for me. The light was bright in a dark room, but I doubt the 90 L claim. All in all, good light...I wouldn't want to defend my life with it. It was a fun toy. If you want a legitimate light on the end of your gun, you'll have to spend a lot more money; this one is way too long and the battery/bulb connection way too unstable.