Excuse me, what is the expansion method of the airbag expansion bracket of PopSockets bubble SAO mobile phone?

Take a look at the airbag bracket. It is easy to open, mainly because the inflatable structure of this mobile phone airbag is composed of several rubber soft bags filled with compressed air, which are used to support the upper and lower plates and the supporting structure to isolate the goaf. The bracket1* * has three height gears, which can be switched at will or rotated at multiple angles. You can press it back when you don't use it, it doesn't matter at all!