
UPDATE *The mask suddenly started making a loud buzzing noise during operation. It has only been used 8 times in less than 2 hours each time. I only had to charge it once as it rarely writes. I am very disappointed that it broke so easily. I asked for a replacement and the seller said they would send another case. Worth every penny! I have COPD and it's hard to breathe in any other mask. The mask solves this problem perfectly. The HEPA filter really works! I pumped gasoline into a mask and didn't smell the fumes through it! It's very quiet and unlike many things I've ordered from China, this one is very accurate and well made. Its light weight and silicone straps allow it to be worn in different ways for a very secure fit. It comes with an earbud, an extra filter and is rechargeable. I only charged it to fill it up, but it seems like it takes a couple of hours before it needs a charge. It comes with a carrying case that is perfect for the mask. I absolutely recommend it!

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