For speech, it's perfect and the interlocutor hears just fine even with background noise. Now for music sound, I would say it's good, there are definitely better options. Build quality is excellent

I bought them for use with an iPhone 15 since I talk a lot and I wanted a pair of headphones with a microphone. At first, they were okay but after a while, I realized that they both had poor sound quality and I couldn't hear anything at all. I had to constantly disconnect and reconnect them hoping they would work properly, but they would still make a buzzing noise to the person I was talking to. Additionally, they produce interference, especially if the cable touches your body, so for me, they are not worth it. I don't know if they were like this from the beginning or if they became like this after a while, but I only used them in an office setting, I didn't take them outside.

The worst thing I have ever bought in my life. You can't even drink water without your conversation partner thinking their eardrum will burst. It has parasites on its own as soon as you connect it. Mercy to sell such useless things for 35 euros.

I bought them for my wife as a new hands-free device. Excellent cable that is hard to tangle (it is flat), very good build quality worthy of Belkin and truly HD crystal sound. They are worth their money and more.