From Akai:

KEY FEATURES
Provides extensive hands-on mixing, transport, and Serato NoiseMap capbility for Serato DJ
Plug and play with Serato DJ (included) - no upgrade purchase required
Expands control options to nearly any DJ setup
2 line faders with gain controls and tri-color LED metering
2 Phono/Line Inputs for Serato DJ Control Signal
Pro-grade, adjustable mini innoFADER™ crossfader with reverse switch
2 sets of line/phono inputs for Serato DJ NoiseMap (timecode) signals*
RCA audio outputs for sending your mix to speakers or amplifier systems
9 touch-activated knobs for groundbreaking EQ kills and Filter sweeps
3-band EQ per channel with dedicated filter knob
Dedicated cue mix and cue gain knobs for custom headphone mixes via the 1/8-inch (3.5mm) headphone output
Rotary-push knob for seamless library navigation and track search
Load, search, transport, cue and sync buttons for each deck
USB-powered for simple setup and useLow-profile, portable design
Dimensions: 1.7 inches tall (42mm), 10.7 long (271mm), 5.3 wide (134mm

*requires Serato DVS Expansion Pack, sold separately

KEY FEATURES
Provides extensive hands-on audio command of Serato DJ
Tweak effects, manage loops, trigger samples, set cue points, and more
Serato Flip-capable – create custom edits, extend your music or re-imagine it altogether in the studio or club (download included)
Adds additional control options to any Serato DJ setup including DVS and HID players
4 decks of Serato DJ control over a single USB connection
9 touch-activated knobs for groundbreaking effects tweaking and EQ kills
8 velocity-sensitive trigger pads with backlit RGB feedback
10 pad modes for hot cues, loops, slicing, and sample triggering
Instant, tactile DVS mode switching: Absolute, Relative and Internal
Endless Controller with LED timeline for instant access to any point in the track
Endless Controller doubles as pitch bend and macro effects control
Backlit digital display provides feedback of parameter valuesLow-profile, portable design compliments any setup, anywhere
Dimensions: 1.7 inches tall (42mm), 10.7 long (271mm), 5.3 wide (134mm)