The Pioneer CDJ-850k is the baby of the CDJ-900 and CDJ-2000 with similar features as the flagship cd midi players.
With features such as large rotary dials, wave display, tag lists via rekordbox software and auto beat loop the cdj-850 has taken over from the old cdj800mk2 and improved immensely.
Loaded with features, the CDJ850K brings Pioneer's pro-quality sound, design and mixing tools within the reach of the aspirational semi-pro DJ and smaller venues. As well as spinning MP3, WAV, AIFF and ACC encoded CD/CDR/CDRW's, you can plug in a USB Flash Drive and mix tracks off that too. Despite the price point, it’s capable of playing professional 24-bit music files. It can be used as a Midi controller and 24-bit soundcard for music software, and with HID capability, software companies will be quick to announce Plug&Play support.