【Main Features of the CDJ-850】 2) Inherits the High Operability of the Professional Series It adopts the layout of the professional series, which has high operability, including a large jog dial with a diameter of 206mm. 3) Supports Various Media and Music Formats You can enjoy DJing using music CDs, USB devices of mass storage class※1, and various music formats※2 recorded on CD-R/RW. 4) Music Management Software "rekordbox" to Support Your DJ Life By installing the included "rekordbox" on your PC and analyzing music files, you can manage them in a format suitable for DJing. 5) Can be Used as a Controller for DJ Software and a Sound Card※3 It supports USB MIDI/HID control, and you can connect it to a PC to control various DJ software. You can also use it as a sound card. 6) Versatile Display for Speedy Song Selection By combining a GUI that clearly displays information of music files such as song title, artist, and BPM, and an easy-to-use rotary selector, you can select songs quickly. You can also grasp the overall flow and intensity of the song with the "WAVE" display. Product Condition Disassembled once for internal dust removal and pickup lens cleaning. Removed stickiness from jog control, removed internal dust, and greased. Coating agent applied for a glossy finish. It is also designed to prevent dirt and dust from sticking. There are some scratches. Please check the condition in the photos. I do not have a PC or USB, so I cannot confirm the operation. Accessories are only the power cable.