EDIT: It turned out to be a defective item. Not only the assistance service was kind, understanding and patient with my noobiness, they sent me a replacement and now I can definitely say it works perfectly. Finally I can listen to Bohemian Rhapsody without losing half of the sound. :)
I would recommend this earbud to anyone who is deaf from one ear or needs to be aware of his surroundings while listening to music.
At first I was very pleased with this product. The sound was pretty good, I could finally listen to music without losing half of the sound since I'm deaf from one ear. But after a week this earphone stopped working properly, with just half of the sound until it even stopped to work at all. I'm very disappointed with its build quality, considering I was very careful when using it.