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No hissing, static, echo or anything. Clear voice chat in games. Connections are nice and tight. Using with Arctis 1 headset with AMD X470 onboard audio and Windows Spatial for Headphones. No complaints. I bought a UGREEN Y-adapter last year with no problems, but my new headset has a single 3ft 3.5mm (too short) so I needed an M/F extension.
A good replacement for my older cable which failed around the 6 year mark - probably due to me placing my computer on top of it a few times and pulling it out from underneath several times. A heavier cord might make a difference in my case.
I use this extension for my work computer headphones. I never move around while using it, yet it is already starting to give static and you constantly need to shift cable around to get audio left and right audio in your headphones. Very low quality product. Avoid.
There's an echo from my speaker output mixing into the mic input, I tested it without the extension in place and it wasn't there, so there's some poor insulation between channels. It's not horrible, but it's definitely there.
Using it with a V-MODA BoomPro and a Philips shp9500