For the people who are curious about the technology behind the FreeBuds 4, Huawei releaseda video.
It says 100 people’s ear are scanned through 3d scanner. This way they had complete detailed ear database. And after that obviosly with the help of the 3D Computer Aided Engineer they had chance to try their 3d design virtually on these 100 human ear.
After that these models printer in 3D printers and tested under real conditions like running, jumping etc.