3 Seconds Finish HEPA Filter Cleaning 
 With the patented-designed function, simply twist the rotary knob on the lid of the dust cup after each use,makes the HEPA easily remove the dust inside the container. And you can: 
 1. Save your manually maintenance effort; 
 2. Keep your hands clean and prevent secondary pollution; 
 3. Get a HEPA with 2X lifespan.