Dust shaking system: The user's walking motion causes a plate to strike the dust bag, loosening the dust for increased 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 greater endurance, longer lifespan, and more compact design. Conveniently carried like a backpack with padded shoulder straps. Telescoping suction tube. Up to 140 minutes of operating time when using 2 x BL1860B batteries. Delivered in a box without battery, charger, or case.