Then at least look at their patents on control systems, which can at least prove that this enterprise has mastered the core technology.
Secondly, there must be a rohs report, which is actually very important. It tells you intuitively that the materials used in this product are at least safe, healthy and environmentally friendly to the body.
There is also the national product inspection report.
The so-called imported products are very simple. First of all, let's see if this company has the right to import and export. The documents involved are: import and export enterprise customs declaration registration certificate, self-care customs declaration unit registration form. You can think about it. Why do foreign brands authorize companies without import and export enterprises to act as agents in China? You have no right to import or export. How did your products get into China?
In China, product quality is directly related to certificate. Without a certificate, the credibility is low.
As far as I know, the intelligent control of fresh air system has the function of air quality detection. The patent certificate is in the hands of Mia fresh air system, and the DC variable frequency fresh air system patent is also in the hands of Mia fresh air system. When you buy products from other brands, you may accidentally buy products that infringe others' patents. It is said that it is quite embarrassing.
In addition, each certificate has a website where you can check the authenticity. Please don't forget to check the website of the issuing unit or institution when authenticating the certificate. It is said that reporting forged documents can be rewarded handsomely.