See a comparison chart from 3M on the difference between N95 masks and KN95 masks.
See filtration test results for the masks here. Our KN95 masks have a waterproof layer in them (seen in photos of mask holding water but not getting wet on the opposite side of the mask) that protects both the wearer and those on the other side of the mask.
While these masks have passed filtration tests, these masks are not medical grade and not intended for use in hospitals. This is why the packaging says “This product is a non-medical device.”