By combining vortex vacuum technology, a pleated scrubbing brush, and a compact design, the Polaris 9100 will clean the pool floor and cove for pools up to 40' in length. Suitable for all pool surfaces. The 2WD rear water propulsion system moves the machine while forcing debris from hard to reach corners. The 9100 has 1 cleaning cycle (2 hrs.) and is engineered with a swivel cord to prevent tangling. This robotic vacuum is lightweight and energy efficient. Top access to the debris canister makes clean up easy and its reduced size allows effortless portability and saves space when storing. This model weighs 13 lbs. and is backed by a 2 year warranty.