What patent certificate does Kexian potential hyperthermia instrument have?

The core of the patented technology of Kexian electric potential hyperthermia instrument lies in the health stone, and it has obtained the national invention patent certificate "An artificial stone with health care function and its preparation method", which can be found on the relevant national websites. When the therapeutic instrument is used, the health stone can release far infrared rays and negative ions for a long time. While releasing far infrared rays and negative ions, it can also shield electromagnetic waves harmful to human health, thus relieving pain and promoting sleep.