When it comes to headphones, there are thousands of choices at different prices, brands, styles, sizes, etc. Under the task of improving their performance, headphones have been changing over time. Years ago, the trend was to use big retro headphones and later they appeared in a smaller size to be more comfortable to wear. The trouble with these was always the same: the cord. Recently, wireless headphones came to solve the disturbing problem of tangled headphones cords.