The vacuum can run up to 40 minutes in ECO or AUTO mode depending on the surface and suction level. In BOOST mode, runtime is shorter (around 11 minutes) for deep cleaning.

The BU3521 uses a removable 2350 mAh lithium-ion rechargeable battery that provides consistent power for cordless cleaning. Lithium-ion batteries are designed for reliable performance and work best when charged regularly and allowed to discharge gradually during normal use.

Yes. The vacuum works effectively on hard floors, tiles, and carpets, and suction adjusts automatically in AUTO mode for optimal cleaning.

The vacuum includes three cleaning modes:
• ECO Mode: Longer runtime for everyday cleaning
• AUTO Mode: Automatically adjusts suction based on floor type
• BOOST Mode: Maximum suction for stubborn dirt and deep cleaning

Yes. When placed on the Auto-Empty Dock, the vacuum automatically transfers dust and debris into a larger disposable bin, reducing the need for frequent manual emptying. The dock can hold debris for up to about 30 days with 1.3 liters, depending on household usage.

Yes. The vacuum can operate independently without the dock, but you will need to manually empty the dustbin.

Yes. The motorized brushroll and strong suction are designed to remove pet hair from carpets, upholstery, and hard floors.

Yes. The vacuum uses HEPA filtration, which helps capture fine dust, allergens, and microscopic particles to improve indoor air quality.

The vacuum typically includes a crevice tool duster, multipurpose tool for versatile cleaning.

The vacuum comes with a 2-year limited warranty that covers manufacturing defects under normal household use.