What will they think of next to get people to spend their money on?
Looks to me like both tubes are for inhalation, and exhalation goes out the exhaust vent in front of the mouth. But with one-way valves to keep you from exhaling air back up the tubes, what happens if water fills one or both tubes.? You would purge whatever amount of water is in the reservoir in front on exhale and then you would inhale the remaining water in the tubes on the next breath? Maybe I'm not seeing something but, to me, it looks like a product liability defense lawyer's nightmare. My 2psi.