Pressure Booster System is an innovative system that allows you to adjust your pressure level without changing the volume of air going into your mask. The Pressure Booster System uses two chambers, each containing its own valve. When you inhale through the mouthpiece, the first chamber fills up while the second remains empty. As soon as you exhale, the second chamber starts filling up while the first chamber empties out. This way, you can control how much air goes into your mask and still be able to breathe comfortably.