Ordered this to sue for a new welder I bought and wanted an auto-darkening helmet. I tested this one when it arrived and it worked great, unfortunately it failed in the quality section. It came disassembled so I found the round buttons with studs (pointing to the plastic) that are supposed to be attached through square holes looked a bit odd but ok. So I proceeded to assemble when I started tightening the plastic buttons on the sides, one was fine the other just skipped the threads and came loose again. Basically one side wasn't tightened so it could stay in the right position when you were upside down. It's a shame that something like this can ruin an entire product, but I'm wondering how they will evolve after a few uses. It is a pity that this article was returned immediately.