Security? The one in Beijing? Where are you from?
Security in Beijing also depends on the situation. There are fraudulent security companies in Beijing.
Generally, the price is more than 2,800 for 8 hours, including food and accommodation. If you have to patrol or work for more than 8 hours, salaries should be increased.
Anyone who works as a security guard in a place like Beijing that does not include food, accommodation or food and whose salary is less than 2,800 is a big liar. Don't go there if you have an ID.
Reliable or not? You should be more vigilant and not approach anyone who pays and shows your ID card, because there is a high chance that you will be cheated