The audio, music and voice that Bluetooth provides are very faithful, you listen and they listen to you perfectly and as glasses they give good protection from the sun. Very easy handling, it is missed that they do not have the volume control on the temple, for everything else, I like them a lot.
As Sunglasses are normal and also do not have polarized glass, they are quite dark (gray). As Bluetooth they are good, with immense audio quality and a good microphone to hear us. At maximum volume, they are barely heard outside or on the side. They lack a volume control for perfection. I like them.