This will allow you to plug in a USB thumb drive if you so desire, in addition to using your phone or MP3 player.
Nke a ga-enye gị ohere itinye eriri USB ma ọ bụrụ na ịchọrọ, na mgbakwunye na iji ekwentị gị ma ọ bụ MP3 ọkpụkpọ.