Review on Wearable Portable Lightweight Allergens Pollution by Naomi Johnson

This product is exactly what I was looking for to air out my face mask. It filters the incoming air through a HEPA filter. The reason I only gave it 4 stars is because I was supposed to receive it on April 2nd and it arrived on April 20th. When I clicked track package, Revane kept telling me my package was lost and I should request a refund. This happened even though I PAID a PREMIUM FEE FOR FAST SHIPPING. The battery life is quite short. Yellowed in about an hour at high speed. I would buy TWO so you have an extra billed unit. You can charge a device that you are NOT carrying with a portable charger. It turns out to be quite an expensive operation at around $250. But it works fine.