18" Walk-Behind scrubber with brush assist. Uses 2 counter-rotating cylindrical brushes. Brushes actually help pull machine along for almost effortless cleaning. Brushes spin at 1300 RPM with 50 lbs of scrub pressure. 17,969 square feet per hour cleaning rate. Machines has 11 gallon solution tank and 12 gallon recovery tank, simple operator interface. Exceptionally durable rotomolded polyethylene construction. Includes on-board battery charger. Comes with 1 pair of soft scrub brushes (K5762172). Low-profile sight line. Whisper Quiet 67 dB. Eco-friendly