ToyGuard: Protects toys and small parts from disappearing in the vacuum cleaner. SmartSensor Control: Powerful cleaning performance at all times thanks to sensor-controlled performance monitoring with LED display. QuattroPower System: The combination of high-performance technologies for outstanding cleaning results. Fully automatic SelfClean System: No dust contact during filter cleaning. HEPA Hygiene Filter: High filtration for cleaner exhaust air. Washable - no need to buy more.