Drain saver keeps debris out of drains. 6" tall rollers protect walls and kick plates. HD Front drive climb ramps. Made in USA. LCD display, 4 hour meters and diagnostics. Recharge counter and chassis hour meter. Automatic brush pressure control with 5 settings. Electric actuated squeegee suspension with automatic up in reverse. Edge benefits include: Chemical free stripping, reduce slip and fall potential, earn LEED credits, 70% reduction in water usage, consistent results with no swirl marks, and wet screens wood gym floors.