The Evolve speaker system includes a charging base and two cube-shaped speakers. Simply place the Evolve cubes wherever you want to hear the music. You can even move them into the next room with you. There are no entangling wires to hassle with. Each speaker cube has its own long-lived Lithium-Ion battery pack, delivering up to 10 hours of music between charges. There's nothing to plug in, and nothing to unplug when you're ready to deploy the music.