The DJM-S7 is  mixer aimed for use with Rekordbox and Serato DJ software and a step up from the DJM-S3 but a bit lower in the line-up than the DJM-S11. for Rekordbox the DJM-S7 is a hardware unlock device so it automatically unlocks the software.

Features

2+3 Channel Mixer
Support for Rekordbox and Serato DJ
3 band EQ/Isolators and Trim per channel
Microphone input with Tone Control
Build in Soundcard with DVS support
Individual variable Channel Fader Curve Adjust
Channel Fader Reverse switch
9 Segement Peak Level Meter
22 Beat FX (same as S11)
MIDI Mappable
Aux input
Large Load track buttons
Lever switches to  enable effects on each channel individually
8 Performance Pads per channel with Mode Selector
Individual Pad Modes for both channels, Serato only
Combo Performance Pad Mode, each row can have different function
Microphone with Tone Control and Talkover
Magvel Crossfader with variable Curve Adjust (same as DJM-S11)
Crossfader Reverse switch
Crossfader feeling/Tension control
Filter Color FX with Parameter control : Low Pass, High Pass
Bluetooth input to play audio from mobile devices
Build in USB Hub to connect 2 DVS players
Solid build quality

Specifications

Inputs : 2 Phono(RCA), 2 Line(RCA), Aux(RCA), 2 HID Controller(USB-A), Mic(Jack)
Outputs : Master(XLR & RCA), Booth(Jack), Headphones(Jack & MiniJack)
2 UBS-B Terminal for computer connection
Frequency Response : 20-20kHz
Signal to Noise Ratio : 103dB
Distortion (THD) : 0.005%
Power Supply : 110-240V AC
Dimensions (WxDxH) : 267 x 397.4 x 107.9mm
Weight : 4.5kg