Implement standavxl: 2015 guideline for CPR

　　Features:

　　1.Simulate standard open airway

　　2. External breast compression, intensity display of corrects (at least 5cm):

　　a. Buzzing sound of correct compression intensity

　　b. Alarming sound of wrong compression intensity

　　3. Artificial respiration (inhalation): the volume of inhalation is observed through observing the wave of breast;

　　4.Operation methods: exercise operation

　　5.Power supply: battery