This device sprays liquid medication into fog panel by compressing air, and form tiny particles, which flow into the throat through a imbibing tube. It adopts oil-free high-efficiency valve with no need for lubrication and it is low noise. It is an ideal product for family and clinic use, and suitable for patients of all ages. A) Features:1. optimal respirable particle size, ranging from 3-6um, can enter into the lower respiratory tract2. portable for clinic and household use, health care at home3. durable compression oil-free piston-driven system4. concealed power supply designing, one-piece handle designing, convenient accessories holding area 5. comfortable and easy to carry, optional components that fit for people of all ages.6. low operational noise, less than 60dB(A)