Features: 1. Simulate standard open airway 2. External breast compression, intensity display of correct (at least 5cm): 1) The yellow indicator light display of correct compression position 2) Buzzing sound of correct compression intensity, the green indicator light display 3) Alarming sound of wrong compression intensity, the red indicator light display 3. Artificial respiration (inhalation): the volume of inhalation is observed through observing the wave of breast
