20m in US alone asthma sufferers. 500m world wide. Let's say 1% of the 20m buy a 50$ app from Isn. There is 10m revenue straight away. It looks simPle but all the foundation work has been laid with the wheezometer. Good times ahead here IMO. Remember $3300 is the average spend per patient per annum on asthma related costs. Bodes very well