Difference in Model Number

What is the difference in the model number 

WD TV Media Player (WDBYMN0000NBK-VESN)

and

WD TV Media Player (WDBYMN0000NBK-HESN)

Thanks

Country-specific stuff, like power supply, PAL vs NTSC, Packaging languages, et.c

HESN is USA.

VESN is Canada.