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ToyGuard: Protects toys and small parts from disappearing in the vacuum cleaner. ComfortRegulator: The clever twist for comfortable vacuuming on all floors. UltraAllergy hygiene filter: excellent filtration - developed for allergy sufferers. Very quiet operating noise (69dB(A)) thanks to integrated SilenceSound system. QuattroPower System: high performance technology from Bosch for first-class cleaning results with low energy consumption.