Sorry we don't have an ETA so will not be taking back orders.
A clever tool. It's much more effective than the standard respirator or dust mask, and even you folks sporting a beard/mustache will get to have clean lungs. Intake filters are at the back, away from the "work", so they will last longer. Two things to remember when you use this: the nose clip can be made comfortable yet still effective by bending it open, if need be. And, the mouthpiece sits between your lips and teeth. You don't bit-down on the mouthpiece like you would with a snorkel.
Filter efficiency is rated at 99.97% down to 0.3 microns for nuisance type particles not containing oil... ie these are dust, not chemical filters. Comes with two HEPA filters and nose clip with tether. Seals to your face even with full beards and allows for total visibility in all directions. Not only compatible with full-face shields and safely goggles, but it won't fog them up.
Made in the USA