Features:

CDJ-900

Enables playback of MP3, AAC, WAV and AIFF audio files from CDs and USB memory devices
Compatible with CD, CD-R/RW, USB devices and SD memory cards
Jog dial provides for further customization and control for DJ operation
Pro DJ Link enables up to 4 CDJ-2000s or CDJ-900s to be connected to share a single music source.
HID and MIDI controls allow up to 35 controls on the surface of the player to trigger other MIDI devices
Frequency range: 4Hz - 20kHz
One USB-A, one USB-B port and LAN, 100 base-tx ports
Coaxial Digital and Analog RCA audio outputs
12" W x 4 1/2" H x 14 3/4" D
Includes rekordbox® music management software.
DJM-2000

Industry-first 5.8" full color multi-touch display
Internal USB audio interface allows direct computer connection without the need for an external sound card
Pro DJ link that connects up to four CDJ-2000/900s
Manipulate frequencies and alter sounds with EVOLVED BEAT EFFECTS
INST FX (Instant Instrument Effect) allows effects to be applied intuitively with a turn of the knob
Live Sampler capability which allows the sound from a microphone or from the MASTER output to be recorded directly into the mixer
Switching 3-Band EQ/Isolator
Digital inputs allows audio transfer with no deterioration in sound quality
Talk-Over function lowers the volume of the music when a connected microphone is used
Cross fader Assign function allows the flexible assignment of the input on each channel to the cross fader
Fader Curve Adjust function allows changes to cross fader and channel fader curves
Includes USB cable, 4 LAN cables and AC power cable