Why does this flashlight turn itself off after several minutes from being turned on? Is there a setting that can be changed and if so how do I do that?

Apparently it comes in demo mode indefinitely until you turn it off yourself. You do this by quickly clicking the on/off button twice. This will bring it out of demo mode and into regular mode. This worked for me and hopefully it will work for you too. I understand the reason for this demo mode, but what I don’t understand is why they don’t tell you how to undo this feature when ready for use?