No manual included but this Amazon page. I was able to follow the instructions with no problems, the hardest part was getting the top strap through the top of the visor. After assembly, there is a button on the front of the face to adjust the tightness. There is another strap that can be tightened at the top of the head. I have not used a battery holder and do not intend to. Overall I found it more convenient than the existing poor implementation.
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