Maytronics 99991013-US Dolphin Supreme M4 Robotic Pool Cleaner with Caddy Maytronics dolphin supreme M4 robotic pool cleaner cleans pool floor, cove, walls and waterline Recommended for in-ground residential pools up to 50-feet in length Full filter indicator lets you know it's time to clean the cartridge Scrubs, vacuums and filters all pool surfaces in just 2.5 hours Easy-to-clean top access cartridge system