CleanMate QQ3-LT is the next generation of QQ2. It has all the good features of QQ2 and more. Two-stage cleaning with strong vacuuming power, QQ3 can clean dirt, dust and pet hair. Optional sonic wall to confine cleaning area; its function is similar to virtual wall. QQ3 has better intellegent to search and locate charging base quickly. QQ3 can work ceaselessly up to 100 minutes on a single charge.