CE certificate is a safety certification mark that indicates that the product complies with European safety standards and can be sold in the European market. To check the CE certificate, you can follow the steps below:

1. Log in to the official website of the CE certification agency. You can search for information such as the issuing authority and validity period of the CE certificate on the website of the CE certification body.

2. Select relevant options such as "CE Certificate Query" or "CE Certificate Verification" on the website.

3. Enter the relevant information such as the number or name of the CE certificate you want to query.

4. The system will display detailed information about the CE certificate, including issuing authority, validity period, certification standards, etc.

5. If you need to verify the authenticity of the CE certificate, you can enter relevant information such as the CE certificate number or name on the website and select the "Verify" option. The system will require you to provide relevant certification documents or information such as the name of the certification body to verify the authenticity of the CE certificate.

It should be noted that CE certification agencies have a certain retention period for query results, usually around 30 days. If you query within the retention period, the system may prompt that the query results are expired or invalid.

In short, to check the CE certificate, you need to log in to the official website of the CE certification agency and select the corresponding option for the query. It should be noted that CE certification is a strict certification process, and only products that meet relevant standards can obtain CE certification.