Infinuvo CleanMate QQ-2 L Robotic Vacuum Cleaner with Home Charging Base & LCD Display - White,Metapo,QQ2 L" /> Automatically returns to dock for self-recharging when low on battery power Auto-off feature conserves power when unit is not in use and being recharging Five-step repetitive rotation movement provides the most effective way to clean your rooms Three washable filters to reduce cost of ownership Photo sensor detects stairs to avoid falling down