Did Shanghai Laiwei Technology Co., Ltd. wear it? How do they make a profit?

Advertising and sales. Are you wearing it? It is a public welfare mask vending machine produced by Shanghai Laiwei Technology Co., Ltd. ... The vending machine is equipped with a special advertising space for placing advertisements and charging advertising fees. At the same time, it can also make a profit by selling vending machines, and its profit model is a mixed model of self-management and sales.