Sharp M and non-M machines

[buzz]

Hi sharp techs,
I'm new to Sharp obviously, but can someone explain why are there M and non-M sharp machines, for example: MX-5070 and MX-M5070, I tried matching the specs, they look the same except for supplies like toners.

My guess is there are have different distribution channels...

thanks.

[JR2ALTA]

M simply means Monochrome. The machines are identical but the M5070 is black and white.