I have for trade 4 electronic air purifying masks and accessories. I was given these masks and won’t be using them. I opened one to take the pictures and the other three are unopened. It looks like they sell for about $150 -$200 a piece online. Plus I have close to 300 N99/N95 filters, 2 carrying cases, spare straps and a tool to make your own filters. From what it says online, it cleans all air of dust, smoke, pollen, etc and runs up to 8 hours before needing to be recharged.
Pittsburgh, PA North
Cleveland, OH South