Certificates from the appearance, are issued by certification bodies, there is no difference. But if you look at the reports on certificates, you'll see that we're different. Take varistors for example: 1. We are the first in the world to obtain 130 ° C certification. 2. In our UL1449 certification, the standard requires that the number of lightning surge 15 times to determine the qualified, and our products after 20 lightning surge impact. Please keep in mind that can read the certificate, can understand the certificate is also your ability. Of course, a high-quality certificate is also a reflection of our strong technical ability.