This listing is for a 2001 Stanton RM-50 Professional Stereo Mixer.  

Big features include 4 channels with a phono input on each channel, and 8 line inputs available among the 4 channels.  Also provides 3 mic inputs with 2-band EQ and a 3-band overall EQ.  Has a booth out with volume control.  Balanced XLR outs as well as a stereo RCA  master out and a stereo RCA record out.  Contains A & B selectable back and forth crossfader with fader start option for fader start players.

Mixer is in solid working condition and has been thoroughly tested.  To see an in depth video of this very mixer in action CLICK HERE.  .. Or do a search on YouTube for "2001 Stanton RM-50 DJ mixer".

Mixer is in full working condition.  

All 4 phono inputs work.  
All 8 line inputs work.   
All 3 mic inputs work and all 3 mic level controls work.  
2-band mic EQ works and mic talk-over, on and off works. 
PFL/cue buttons all work, and indicator lights all work.  
Matrix A, B & bypass selectors on all 4 channels work.
A/B settings all work for crossfader and crossfader works.  
Both "fader start" controls work and both fader start indicator lights work. 
M-band master EQ works and on/off indicator light for it works.   
Stereo/mono control works. 
All 4 channel LED level displays work and looks great and main output LED level display work and looks great.  
Headphone input and level control works.  
Cue pan PFL/main slider control works.  
Booth level and out works.  
Stereo XLR and 2x (master/record) RCA outs work.  
Toggles between phono/line on bac for channels 2 and 3 work.  

The 12v gooseneck light input is untested as I didn't have one of those handy.  

Showing very slight minor cosmetic wear.  Little bit of surface coating has come off on channel sliders (see pics).

Outer input toggle selector of channels 2 and 3 are missing (see last pic), but bottom is here and it's easy to change back and forth with your fingernail or a pen.  

I couldn't figure out what the "Sub Mic" output on the back is for, and there is nothing about it in the manual.  Very slight cosmetic wear