Also, "Turn the head of the flashlight clockwise to turn on the flashlight. A counter-clockwise turn will then switch it off. To switch between output modes, turn the light on, then turn it off. Within 1.5 seconds after turning the light off, turn it on again and it will be switched to the next output mode. Repeat this process to continue switching through the modes. If the light is turned off for over 1.5 seconds, the regulative circuit will be reset and the light will default to its primary mode the next time it is turned on." Primary mode is the medium level output.