I came across an article online about a portable audio event. The article said that the company called "earphone labo" exhibited a mini cable and that made waves because the cable never disconnects. It looks like the cable uses room temperature liquid metal, not mercury. The company states that the cables has a distinctive feature which is that the inner is filled with room temperature liquid metal unlike a conventional conductor. It also can also expand a little. The company developed it for earphones. However, the development was so hard because they had to get creative so that the liquid metal doesn't leak due to the tiny parts for the earphones. Since earphone cables might get stuck in something and might be pulled suddenly, they also designed the strength of the cable very carefully. They need to secure a stable supply of room temperature liquid metal as a material and they still have some problems. So, it seems like it will take time to commercialize it. Many people already use wireless earphones like Bluetooth technology. I'm not sure how much demand there will be in the future, but I believe that we can apply this new technology to other things in the future.