Now you can manage your asthma conveniently and effectively with a truly pocket-sized device, proven as effective as MDI chambers nearly twice its size. The Pocket Chamber delivers a high concentration of respirable aerosol, to help provide relief from asthma symptoms while capturing large particles and reducing unwanted side-effects. - whistle alerts patients if inspiratory rate is exceeded - effective, affordable alternative to expensive aerosol delivery - flexible port accepts virtually any MDI's mouthpiece