What does it mean that the factory randomly selects Shenzhen social security?

There is no saying that factories pay social security at will.

The payer must go to the local social insurance agency for social insurance registration and participate in social insurance. And where the factory is located, you have to pay social security, and the place where you work can participate in social security.

Social security refers to pension, medical care, work injury, unemployment and maternity insurance, subject to the full social security purchased by the company. Medical insurance 2%, company 8%, endowment insurance 8%, company 12%, unemployment insurance 1%, and the company is responsible for 2%. All the expenses of work-related injury and maternity insurance shall be borne by the company.