If you are unsure check your model number (MFG#) on the data tag. If it starts with "B", you have Brisk 2.
All Dometic Air Conditioners will have two data tags.
One accessible on the bottom of the AC base pan (visible with the inside ceiling assembly filter removed).
Another tag is located on the top side of the unit underneath the shroud (the location of this tag will vary from model to model).
Both the top and bottom tags are identical.