Slight buzz when not playing sound.

Item is supposed to include a built-in microphone for phone calls, I am not sure, if there is any, and if there is it is not noticeable when you’re having phone calls (but you can listen to them though so I guess you should just make sure your phone is next to you).

The sound quality is not brilliant (but still adequate).

I did not manage to place the headphones exactly on my ears so some people might find it difficult to fit their head shape.

I am quite sure this is not water resistant so please do not try to wear this when it rains.