The DGT North American was developed in cooperation with the United States Chess Federation for the US market, but later also released on to the global market.
The Delay option was made to suit US custom and is different from FIDE clocks.
All other options are according to FIDE rules. See the manual for more detailed information.
To compare the options between DGT NA and DGT 2010 please see this link to our frequently asked questions section.