Is Qing Dade's brain healthy and safe?

That's an alternating magnetic field. If you use it carefully, it may not be effective, but it may be harmful.

I checked: the State Administration of Medical Supplies has no approval for this medical device at all. This product is the approval number issued by the local government, so it is not very formal. I suggest you not buy it. Just like when we buy medicine, we must insist on buying medicine with "national medicine quasi-word"