Advice on Business Trip

Dear Sir,

I have received Business Visa ( M- Type ) on the basis of invitation letter sent from the china company, where i am visiting .

is there anything ( except invitation letter & M type, Passport ) that i should ask from the company , for traveling ,( i.e Confirmation Letter of invitation ) etc ?

whether this " Confirmation Letter of invitation is Required" ? Please advise.

Thank You ,

Regards,
Sunil Kumar
Mumbai, India