Yes, the EWI USB has two mouth sensors, the breath which is the pressure of the air you blow in it, and the bite, which is the force you bite on the rubber mouth piece.
The white part (Mouthpiece) is some kind of hard rubber / plastic tube that you can bite tight
Each sensor can send out it's value two different CC# .
I use a great app for configuring the controller called "Akai EWI USB Control" by Cognitone. It's free and works on Windows or OSX : http://www.cognitone.com/downloads/index.stml?p=4
It even offers a "Filter notes" mode that can be very useful when you already have your sequence and just need to add expression. (I quite like using it while playing my lines on a keyboard, and blowing at the same time, because I don't know the fingering very well)
It's a quite fun device, real saxophone players don't like it much because of the touch sensitive fingering (no mechanical parts) and the whole blowing thing is quite a different feeling. But it gives a totally different result in expressiveness than expression pedals or knobs. I like using it with string type sounds, or any fun programmed synth patch.
It's really easy to use with the axoloti too. just assign the CC, adjust some scaling if needed, and Voila !