How do security companies make money?

You sign a residential security contract with a property company, stipulating the total monthly security fee of the residential area, that is, the monthly income of the security company. There are two types. One is that the property bears the costs of security projects, such as security service rent and office expenses, then your profit is income minus labor costs, and the other is all-inclusive, and the property spends nothing except the total security costs, then your profit is equal to the total minus the sum of your labor costs and goods funds, 1 yuan of residential area of property costs.