The difference between the Bissell Pet Stain Eraser regular model 2003, Deluxe model 2002, and Deluxe Ion model 2164A is as follows.
The Regular model is green,takes 4 hour to fully charge,runs about 15 minute per charge.
The Deluxe is pink, it is almost the same as the regular model but includes an additional Detachable Window Tool that is designed specifically for cleaning windows and mirrors. You can use it to spray, scrub and remove dirt, grime, smudges, finger prints & pet drool from hard surfaces.
The Deluxe Ion model is teal, also comes with the Detachable Window Tool. And it features a larger battery, takes 8 hour to fully charge, runs up to 30 minutes per charge.