Frank
Sasquatch
The one I got came in a bag with no instructions. How do you switch from 3 to 5 modes to get medium and SOS? The headband is useless for normal sized heads, so I cut off the band and tie wrapped the mount on my helmet. There's probably a better way.
I used a mount from another light for mine...worked great.
To switch, turn the light on and hold the button in for 3-5 seconds. You should see the led change from green to red, and it's in the 5 mode then. You will have to repeat this process each time you unplug the light. It's right there in the instructions, don't you understand translated Chinese??