Got the light with no instructions and to turn out off hold the power button, otherwise it cycles thru all modes. It also comes with a charged 18650 or you can use the adapter that holds 3 AAA batteries.
The on / off switch is not easy to use. It turns on full bright with the first click then you have to click through to dim it. If you click to much you get strobe or sos whether you want them or not. Comes with 2 rechargeable batteries and a AAA adapter. They work very good. Easy to adjust from a flood to a spot light. Seems to be well made Not nearly as bright as advertised. OK for the price, but not great!!