Do you mean peaking? If so, then yes - it just duplicates what would be on the LCD.
Best Regards, James
Sorry, yes i meant peaking.
There is a reason why i am asking. I bought Sony CLM-V55 Portable Monitor for NEX7. And one of the specifications of this monitor was - Peaking Support for Precise Focusing. So it means, that not every EVF of display devices support peaking. Isn't it?