Brown marmorated stink bugs are large (3/4 inch long), brown, and have a pattern of black and white on their backs. They are most easily identified by their large size and their patterned backs.
The best way to get rid of brown marmorated stink bugs is to eliminate their food sources by thoroughly cleaning your kitchen and bathroom. You can also use commercial fly traps or bait. If you have a severe infestation, you may need to call a professional exterminator.