Quality with the price. It should not be expected from the excellent. Approximate assembly instructions in English. I put 4 stars because for the moment he responds to my expectations. Facilitates fitting, hold very well in the ears despite moves (bicycle), decent sound quality even if it lacks a little bass. Becomes uncomfortable after several hours. He holds a charge well (5 or 6) non stop. I wanted to take the equivalent of at nokia but they do not make a USB cable for charging.