Implement standard: 2015 guideline for CPR

Features:
1. Simulate standard open airway
2. Support training in artificial respiration and external chest compression
3. Compression Frequency: 100-120 times/minute, take the"tick" sound as the sign,and the compression depth should be 5cm-6cm;
4. The inflated tidal volume can be observed by the chest rise, commonly it should be 500-600ml.
5. Power supply: power adapter