Dyson Ball, Turns on a dime, No loss of suction, Concentrated technology for all floor types, Ball technology - Steers smoothly with a turn of the wrist, Root Cyclone technology - Patented technology that doesn't lose suction power as you vacuum, Ultra-lightweight - All around performance, but only 2/3 the size. Weighs only 11.70 lbs., Cleaner exhaust air - Air expelled from a Dyson has up to 150 times less mold and bacteria than the air you breathe, this vacuum is certified asthma & allergy friendly by the Asthma and Allergy Foundation of America