They say you get what you pay for, but in this case even 15€ is too much. The sound is the worst. It makes noise and distorts to the point that if you listen to music, it disgusts you. Non-existent bass and treble. It sounds like listening from a battery-powered radio from the '80s. Sound from short waves sounds better. When you have it in your ear without playing anything, you hear a constant buzzing, so it's not even good for conversation. It was tested with two mobile phones and a laptop. Just think, I returned the first pair as defective, I got a second one and it's the same... That's just how the headphones are.