I bought this hoping it would keep sweat from seeping into my mask so I wouldn't have to keep changing it. Not only does it work, I use fewer masks because of this fan. Although I sometimes have to walk, this mask vent not only helps my face dry in the mask but also makes me feel like I'm getting fresh air without constantly sounding out of breath. The fan itself is attached to all sorts of masks I've had to wear. I have used this with Cloth, OP, KN95 and N95 masks. Not only does this fan stay strapped in, it didn't pull my mask off either. The fan itself is fully rechargeable and on a single charge I was able to use it for at least 2-3 days before having to charge it again. A couple of times I've managed to get 4-5 days without a charge, but it depends on how much it's used. Really helps and not only does it help keep my face from sweating too much but it really helps me feel like I'm getting 'fresh air'.
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