The Smartpool NC52 Robotic Climbing In Ground Pool Cleaner is a robotic cleaner designed for inground pools up to 20 feet x 40 feet long and 8 feet deep. Its revolutionary lightweight design cleans and brushes floors and walls up to the waterline. Smartpool's Quick-Drain technology empties the cleaner in seconds, allowing you to quickly and easily remove it from your pool. The NC52 Climber features two cleaning cycles: a 1 hour rapid cleaning mode and 3 hour standard cleaning mode.