1, basic customer information 2, model and quantity of products purchased by customers 3, product maintenance records 4, product failure summary 5, customer's information feedback on products, and internal reference materials such as customers' previous contributions to the company's business can be added as appropriate.

Generally speaking, customer information is the best way for a company to know its customers, so it is necessary to carefully complete a customer information, summarize it regularly and send it to the senior management for review.