| http://www.w3.org/ns/prov#value | - echnology employs an acoustic sensor to identify dirtier areas and spends more time cleaning themRoomba 650 picks up an amazing amount of dirt, pet hair and other debris with its patented 3 stage cleaning systemThe robot can be scheduled to perform up to seven cleaning sessions per week, even when you are not homeThe included Virtual Wall keeps Roomba cleaning where you need it and blocks off-limi
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