Detailed Answer
Criteria for a reliable brand: 1. qualifications (verifiable SRRC/CCC/CE certificates); 2. factory (on-site visit/video audit); 3. cases (same-industry customers); 4. after-sales (warranty terms/response speed); 5. reputation (industry reviews); 6. reasonable price (not too low). LDER and Xingjia both meet these.
| Qualification | Verifiable certifications |
| Cases | Same industry |
| After-sales | Clear terms |
Note:On-site factory visit before signing is the safest.