The Dolphin Supreme M4 Robotic Pool Cleaner brushes, scrubs, vacuums, and filters the entire pool including the floor, walls, and waterline. The new, advanced technology enables optimal scanning and pool coverage in a shorter cycle time. This robotic pool cleaner features scanning, water line cleaning, top access, extra active brushing, and the option of 3 types of filtration. The Dolphin Supreme M4 is recommended for pools up to 36 feet in length.