What is the new technology of "brain-computer interface" researched by elon musk?

Brain-computer interface can be understood as a port of the brain, which can connect the human brain with external devices, thus establishing a direct connection path. Musk founded a brain-computer interface company called Neuralink on 20 16. At the beginning, this technology was successfully tested on monkeys, mainly because it has new help for many health symptoms of people. The domestic Boruikang company is also making a brain-computer interface, which is not the same as Musk's way. At present, it seems that this track is about to rise.