What should a invitation letter include for China Visa?

The sample of invitation letter for China Visa is shown below:

Date: 2^nd March 2016
To the Chinese Consulate:

We would like to invite the following individual to visit China for business purposes:

Name: Peter Johnson
Gender: Male
Date of Birth: 1970-04-01
Nationality: US Citizen
Passport Number: 12345678

Mr. Johnson is of The Company A
During the visit, he will meet with the office managers of Company B .Mr. Johnson will arrive in Shenzhen on 10^th March 2016 and remain for approximately 3 days. He will leave China on 13^th March 2016 back to Hong Kong. Since Mr. Johnson is expected to make several trips to China in the near future, we would appreciate it if you could issue him a multiple entry business visa.

Mr. Johnson will be financially responsible for his visit, including round-trip train ticket, room and board and other travel expenses.

If you have any questions, please feel free to contact us at any time.

Sincerely,

________________________
Marry Chan & company chop
Manager
Address:
Telephone: