May 2020. JBLcharge4 is the fourth generation war drum and the fourth generation music war drum series released by JBL Company. This version was officially launched in May 2020. The function keys of the drum 4 speaker are all designed at the top of the box, protruding on the surface of the woven net. These floating island-type solid keys feel good, and the combination of keys and fabrics is firm. JBL is the world's largest professional speaker manufacturer, and everything from raw material development, speaker unit design and production, speaker design and production can be completely controlled by itself.