As per the Shark, Models start with AV are designed to Amazon, and UR are designed for Wholesale Clubs. For example, AV2511AE, AV2501S, etc are for Amazon is same as RV2501AE; UR2350AE is designed for Sam’s club is same as RV2300S, RV2310AE; UR2500SR is designed for Costco same as AV2511AE, RV2502AE; RV2320S is designed for Best Buy, same as RV2300S, AV2310AE; RU2350AE; RV2011 is designed for Target, but same as RV2001, RV2002. The differences is the color and size of the dust bin. For Example, UR2350AE come with 60days capacity bin, but RV2310AE come with a 45 days size, and RV2300s come with 30 days size. When you buy the Shark AI Robot Vacuum, all you need is to determine which series you want within the series 2000, 2300, 2400, 2500, 2600. Answer from Deleted User on reddit.com