Dust shaking system: The user's walking motion causes a plate to strike the dust bag, loosening the dust for greater effectiveness. The mechanism can also be manually activated with a lever. Highly effective HEPA filter. Memory function: When turned on, the vacuum starts with the same suction power as before it was turned off. Brushless motor for more endurance, longer lifespan, and a more compact design. Conveniently carried like a backpack with padded shoulder straps. Telescopic suction tube. Up to 140 minutes of operating time when using 2 x BL1860B batteries. Delivered in a box without battery, charger, or case.