Robo-Clean Robotic Aboveground Pool Cleaner - Automatic above ground pool cleaner recommended for pools up to 31 feet round. Thoroughly vacuums pool floor. Self monitoring SmartChip ensures most comprehensive cleaning coverage. Operates independently of pool pump and filter. Uses low voltage pump motor - costs pennies to operate. Direct drive motor - no belts to break. No installation required. Machine washable filter bag. Automatic shut-off after 2 hours. Uses a ELA transformer in a weatherproof casing. Comes with a 40' cable. 1 year warranty.