If you don't have a sterile environment, don't even bother. I bought one for my phone and this one for my duo. Not worth it unless you live in a hermetically sealed room with absolutely no dust. With both, I quickly took them out of the box and tried to put them back in, but the dust still got in. It will not close even if there is even a little dust inside. Every time I tried to take it off and fix it, it got worse. Almost invisible hairs, dust I could barely see with the naked eye, etc. making it look like crap and less effective.
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