CleanMate QQ2 Plus II has one Sonic Wall (works as virtual barrier). User can use this Sonic Wall to define CleanMate movement boundary and block any area which Cleanmate will not do cleaning. You can define QQ2 Plus II unit daily cleaning scheduling time up to 7 days per week. That means all cleaning will be done automatically according to your set up day and time. It can easily handle various surfaces including carpet, hardwood tile and linoleum. It can also go underneath the beds and other hard-to-reach places to clean dirt, dust and pet hair while simultaneously killing bacteria and deodorizing with its ultraviolet light. With Cliff Sensing technology built-in, CleanMate intelligently avoid stairs and ledges. CleanMate can work ceaselessly up to 70 minutes on a single charge.