Mr. Hey is a redesign of the asthma inhaler for pre-school age children. It eliminates the cold figures associated with medical devices and brings warmful human-centered design solution into the product. The design enables parents to change the amount of spray based on the weight of their children. What is more, the inhaler is embedded with the peak flow sensor to monitoring the lung condition (which influence the asthma inflamatation) and visualize the data on the phone. The above features form a holistic treatment process for children with asthma.