An All-in-One system in the context of DJ controllers is a device that combines all the essential components needed for mixing music into a single body. It functions as a combination of two or more music players and a central mixer, which is the section where audio tracks are blended and adjusted. The main feature of these systems is their ability to operate standalone, meaning without the need for a connection to a computer. They contain their own processor, operating system, and a display that shows all the necessary information about the tracks. A DJ can thus simply connect a USB drive or a memory card with prepared music and start playing immediately. Although they are designed for standalone operation, most of these devices can also be connected to a laptop and used as a standard DJ controller to operate software such as Serato DJ Pro or Rekordbox. It is therefore a complete and portable solution that offers the full-fledged features of a professional DJ setup in one compact device.