Vortex vacuum technology works quickly and efficiently to scrub pool floor and wall coves. Compact design and all-terrain wheels manuever the tightest pool corners, tile line, and steps. ActivMotion sensor automatically sense position and adapts cleaning path for optimized cleaning and prevents cord from getting tangled. The large, easy-to-clean, quick-release filter canister has four times the capacity of similar cleaners. Filter canister's unique construction lets you simply shake out debris, then hose the canister clean. Enjoy a crystal-clear pool in 90 minutes without lifting a hand with the most advanced robotic cleaner on the market. The Polars 9400 Sport Premium combines 4-Wheel Drive and ActivMotion SensorTM with patented Vortex vacuum technology that captures small and large debris from the pool bottom, walls, tile line, and steps without losing suction. Plus, the 4-Wheel Drive tackles any pool terrain. . . . . . Runs on two cycles, 90 or 120 minutes . Efficiently cleans pools of all shapes and surfaces up to 20' x 50' . Includes a 60 ft. double-insulated floating cable and premium transport caddy . Rear water propulsion system eliminates the need to pull a water-logged cleaner out of the pool . 2 year limited manufacturer warranty .