Well, from my understanding, you stick one of those filters in it, and then you stick one end in your mouth, and the other end in their nose and you suck. Lol. The filter stops it from getting in your mouth. I'm not really sure what the bigger tube part does, but I think that's the whole process. My friend swears by it!
To Judith, it sounds gross, but our pediatrician recommend the nose freida and it worked like a charm. Our baby did not like the thing in his nose, but he could breath much better and I highly recommend it:)
Nope! Never been opened. It still had ribbons tied on it from my baby shower, that I just cut off for the pictures. I was never brave enough to use it.