Features: 1. The model can be worn on the shoulders of students, a group practice for two students: one to act as nurses, one to act as patient. 2. Imitate shoulder and upper limb structure of adult simulation, compact design lightweight, and closer to the real environment. At the same time, the skin texture is very realistic, is not obvious needle marks. 3. Red light and sound will alarm if injection is too deep or the position is wrong. 4. Allow the injection of simulated liquid discharged from the drain pipe.