I'm one of the victims too notebook battery 50$ (wrong battery ) anti pollution mask 17$ with air valves to prevent fogging of your eye glasses. There are no valves, the filters, supposedly PM 2.5 can't possibly work the way they fit in, wearing no mask would be just as good. If this mask would have been tested it would have never made it to market. I can't be the only naive person to buy it, I'm sure Battdepot knows about this but keep selling it. I find any Chinese seller online very untrustworthy, there must be some consumer protection laws to hold them accountable Bunch of crooks User's recommendation: I would go so far as to say, don't deal with any Chinese related sellers.