Just got a Telex XGen...Help with Model#

Hello everyone. I just picked up a Telex XGen slave and master but looking around for a manual is pretty tough. My model number is 301040110 4CH M XL.

The catalog I can find online only mentions the 8x and 16x. Does the M in mine mean Mono or Master? If it's a mono I guess I just copped the wrong one. lol

Thanks in advance.