Music can be controlled on the watch in the Spotify or Deezer app and up to 500 songs can be downloaded.
There was probably an error in the transmission of the specifications. The watch is the black version, the case and strap are in the colour black.
I will have the specifications adjusted, thank you for your attention!

Thanks for the answer. So also download MP3 from the computer to the watch and listen to it with the Bluetooth headphones while jogging.