Self-adjusting pad pressure. Easy tip back feature for easy pad changes. Heavy duty, rugged polyethylene construction. Power traverse (20T) model has variable forward and reverse speeds. Exceptional dust control with felt sealed shroud and filter bag. On-board battery charger. Model 20 is pad assist. Maintain the high gloss in your finish with the green-friendly Fusion burnisher. Battery compartment is easy to access. Polishing Rate: 24,000 sq ft/hr.