Bagged version power units feature a sleek design allowing them to mount closely against the wall so you can make the most of your space. The power unit has a revolutionary internal sound suppression system that provides quiet performance. A convenient status light on the power unit indicates when the replaceable bag is full and needs to be changed. New motor designs have up to 5 times more cleaning power than conventional vacuums. With better filtration, you won't be spreading the dust around -- because microscopic dust particles are exhausted to the exterior of your home.