Security in Beijing depends. There are no deceptive security companies in Beijing.
Generally, it costs more than 2800 yuan for 8 hours, including food and shelter. If you are required to patrol or work for more than 8 hours, you must raise your salary.
As a security guard in a place like Beijing that doesn't include food and shelter, the salary is less than 2,800. You are a big liar in Nima. Don't take your ID card with you.
Whether it is reliable or not, we must be vigilant. Don't go to those who pay money and pledge ID cards, which will probably kill you.