Triple action cleaning system: dual edge brushes, brushroll and powerful suction pick up dirt, pet hair and debris, even along edges & in corners Lithium Ion battery: lasting, powerful, hands-free cleaning with up to 80 minutes runtime on hard surfaces Multi-surface adaptability: self-adjusts to easily cover carpet, hard floors, tile, and laminate Convenient, flexible cleaning - easily schedule the SmartClean to clean while you're away or when it's convenient Automatically docks and recharges. Cliff detection avoids stairs and other drop-offs