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 DJ play 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 DJ play. 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) Various Display Displays 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 strength 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, but the condition is good. Please check the condition in the photos. Accessories include power cable, RCA cable, instruction manual, and CD. *In addition to the accessories, 　classic pro RCA cables x 2 sets 　16GB USB memory x 1 　↑↑ will be included.