The popcorn maker uses two innovations that concentrate microwave radiation onto the popcorn. First is a removable base that locks onto the transparent bowl. Second is a disposable paper cup that fits into the bowl's bottom. A package of eight cups accompanies the unit, and others can be purchased separately--each is good for about 12 batches when used with oil or 24 without oil. Both bowl and lid are dishwasher-safe. The popcorn maker is 9-3/4 inches in diameter and 6 inches high and carries a two-year warranty against defects. --Fred Brack