For example, when I take the subway, I pull open the PopSockets bubble SAO airbag and stick it between my fingers, so I am not afraid that many people will squeeze out my mobile phone. When you get off the subway, it's also convenient to press down the telescopic bracket of the cell phone airbag and put it in your pocket. I have used a ring phone holder before, and its function is somewhat similar. However, the ring-shaped mobile phone bracket will hurt my fingers if it is used for a long time, and the design is not as good as that of the bubble airbag bracket. That's all that matters.