The Prowler 820 is the computer controlled programmed pool cleaner that scrubs and vacuums your pool's bottom,walls and steps. The Prowler pool cleaner uses an on-board computer to mathematically map out your pools unique lay-out so it doesnt miss a spot!. The Prowler also provides filtration of the pool water. Totally independent of the pool circulation system. with an easy on-demand cleaning bag. The Prowler doesnt reguire the help of a pump it is totally self contained, no installation, no hoses. Just plug in and drop it in your pool. Cleans pool up to 20x50 feet in just 60-90 minutes.