Since its you, the understanding is that EM has patented various...

Since its you, the understanding is that EM has patented various packaging technologies, since it does packaging itself. From the article:

"Li Guixin, head of packaging technology at Earth Mountain (Suzhou) Microelectronics Technology Co., Ltd., said: "If we compare it with speakers, we have full-range coverage from 0 to 20k hertz. A MEMS digital sound chip can realize all the functions of traditional speakers, and the sound will be very layered. ”Since settling in Changshu, Jiangsu Province in 2021, Earth Mountain (Suzhou) Microelectronics Technology has basically completed the construction of a chip packaging factory, and plans to officially start the mass production of chips in June this year."