The Dolphin is the world's first and best selling robotic pool cleaner. And after 25 years of scrubbing pools clean, it still leads the industry with its advanced electronics, rugged construction, superior cleaning performance, and unequalled service record. The Dolphin scrubs and vacuums the pool floor, walls and waterline and microfilters the pool water – it's like adding another filter to your pool! The Dolphin's reusable filter bag is designed with the optimum porosity to catch the smallest debris yet avoid clogging. It operates with it's own pump and filter system which avoids the wear and tear on your pool pump and filter caused by water-powered cleaners. In fact, the Dolphin saves you up to 50% on electricity and backwashing costs and up to 30% on chemical costs! The Dolphin's water-cooled motors (no oil to leak) are guaranteed for 24 months. Its extra long 50 ft. self-floating cord is attached to a weatherproof 24 volt transformer which is ETL listed for outdoor use. No installation is required just plug it in. It even has a built-in 6 hour auto shutoff and advanced, self-diagnostic software.