Self-propelled robot intelligently sweeps & vacuum floor; Once setting robot goes to work, navigating around obstacles, protected by it non-marring bumper and guided by infrared sensors; Rotary brushes and side brush thoroughly cleans next to walls and hard-to-roach places; After battery fully charged around 8 hours, robot can work 60 mins; Robot will be alert us by the red light when the power is weak; Automatically avoid falling downstairs Automatically turn off when pick up grab handle With standard accessories enclosed; Input by 110V or 230V Adapter Operate by NIMH Battery, 24V/ 500 ma Virtual Wall is operated by 2 x 1.5V (D size)