The requirements for 1688 quotation are as follows:

1. Product information: including detailed information such as product name, model, specifications, quantity, etc.

2. Price information: including unit price, total price, etc., as well as currency unit.

3. Quotation validity period: The quotation should clearly state the validity period, which is usually a certain period of time.

4. Delivery conditions: including delivery location, transportation method, freight costs, etc.

5. Payment conditions: including payment method, payment period, etc.

6. Quotation person information: including the name and contact information of the quotation person.

7. Other terms: depending on the specific situation, other terms may also need to be included, such as after-sales service, warranty period, etc.

The above are the general quotation requirements, and the specific requirements may vary from supplier to supplier or buyer to buyer. It is recommended to understand the specific requirements and communicate with the other party before making a quotation.