雇傭公司寫給美國海關的信的內容包括：

The Admission under the North American Free Trade Agreement (NAFTA) requires:

Letter of employment, on official company letterhead, from a US employer with the following information:

(a) Name of applicant;
(b) Company Name, Address and telephone number; - Description of Company;
(c) Job title the occupation listed on the NAFTA sheet;
(d) Description of the professional activities; - Detailed job description;
(e) Anticipated length of stay (No more than three years);
(f) Educational qualifications for the occupation;
(g) Details of the arrangements for remuneration for the services to be rendered; (Salary);
(h) Signature by a representative of the company ;
(i) Exact work address in the United States.