It's not easy to get familiar with the 16M EarMixers, but they are great little mixers, which can be used with and without AVB connection. Here is an interesting thread in the Live Sound Forum with a lot of insight information and creative ideas how to use the personal mixers. There are also several links to YouTube videos as audio examples for in ear monitoring.
https://forums.presonus.com/viewtopic.php?f=338&t=34516