You can pair as many sets to the one base unit as you wish, even for the whole family. The audio chips in most cell phones and computers these days isnt going to give you the fidelity that reference headphones will give you anyway. Although the padding gets a little uncomfortable after long sessions. However, it is made with 1/8 steel. Great containers. I just need to find a small, good quality, reasonably priced, bluetooth amp that I could pair with some outdoor speakers and Id be all set. I have these slippers, for maybe 7 years. The quality of them was poor. I was looking for a casual, warmer shoe that I could get away with at work. They have a nice case, the charging is confusing.