I've been using this with my Koss Pro4S and everything works as intended.I also tried it with the JBL Tour One M2 and the Bose QC 2023 and it was fine as well. I used the adapter to 2.5mm and connection was perfect.- The cable is braided, pretty flexible, and doesn't tangle.- Connection is stable, but with the Koss, a bit loose but that's because the Koss has connectors that are a bit looser than usual. Nonetheless, it's fine.- Microphone works.- Volume control works.- Mute works, but I feel it could be a bit better. When I mute, I do hear a very slight static or noise, sometimes. And, I wish the mute was a toggle rather than a button that must be pressed. Also, I am unsure if it's fully muting. When testing it it, I saw the animation slightly expanding (the one on the Windows 10 voice recorder app), which indicates that it's hearing speech.- Price is a bit too high for what it is.I also bought a warehouse used V-MODA BoomPro (even more expensive than this, for some reason, and not worth it) from here but that one was broken. I returned that one immediately. I do prefer having a dial for volume control though.This KOKKIA, on the other hand, works great.