Epson WorkForce Pro WF-R569 The product you are asking about is the Epson WorkForce Pro WF-R5691, which is a high-performance 4-in-1 Multifunction Printer (MFP) designed for small to medium-sized businesses and workgroups.
The M and L you reference are likely internal designations used by Epson or its distributors to denote the Ink Supply Unit (ISU) yield that the printer ships with, corr
nding to the ink codes you mentioned previously:
 
Printer Type4-in-1 MFP (Print, Copy, Scan, Fax).
TechnologyPrecisionCore™ Print Head (Epson's advanced inkjet technology).
Ink SystemReplaceable Ink Pack System (RIPS).
DuplexingAutomatic 2-sided printing, copying, scanning, and faxing.