Pioneer Duo Steez Portable Music System (Green/Black) (Discontinued by Manufacturer) 4GB Internal Memory Covered, Rotating Dock for iPod & iPhone Tempo Control: Ideal for practicing choreography, Tempo Control lets you adjust the tempo of any track without changing pitch. Auto Battle Mode: Automatically create group or 1-on-1 battles on the fly, complete with countdown and voice prompts DJ Mix: Eliminates the need for a DJ, DJ Mix automatically puts together non-stop mixes by genre, complete with transition effects between tracks