IT WORKS!!!!!! Finally i've found a cure for foggy goggles. now all i have to do is flip a switch. This is a very good product from G&G. It's very quiet and pretty powerful. I haven't been able to field this yet but so far all my tests have worked. I put on multiple layers on and jogged in place and breathed into the eyepiece to get it humid in there. it was covered on fog. i flipped the switch on and i could watch it disappear. AMAZING!
prevents fog or can eliminate existing fog
a pain to install on my mask but its worth it
might snag the wires on a branch or something
overall: GREAT BUY!!!
Rating: [5 of 5 Stars!]