Custom molded ear plugs. I can play for hours and still hear the full spectrum of frequencies and no ringing.

Oh wow, I'd never hear of Protectli until now and I'm really intrigued. They have a 4 port that looks absolutely perfect! Thanks!

I was using desktop.

I've used it for a while then found it a little janky at time so I moved to FF. This post inspired me to try it again and I will say it seems more stable. Also, the only extension I've installed is Ublock Origin (Chrome) and it works perfectly. This is on the desktop version. It scores 100% on the D3 adblock test. I haven't gotten to play with it on my mobile devices yet but plan on it this week.