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✨ Clean smarter, live fresher — the future of cordless vacuuming is here!
The Shark Clean & Empty BU3521 is a lightweight, cordless stick vacuum featuring a 40-minute runtime, an auto-empty system that seals away dust, and a HEPA filter capturing 99.97% of allergens. Designed for effortless multi-surface cleaning, it combines powerful suction with ergonomic design and a 5-year warranty, making it a top-tier choice for busy professionals seeking a spotless, allergen-free home.










| ASIN | B0D15YWYMD |
| Amperage | 25 Amps |
| Battery Charge Time | 5 Hours |
| Battery Description | Lithium-Ion |
| Battery Life | 40 minutes |
| Best Sellers Rank | #29,466 in Kitchen ( See Top 100 in Kitchen ) #118 in Stick Vacuums & Electric Brooms |
| Brand Name | Shark |
| Capacity | 1.3 Liters |
| Color | White |
| Control Method | Touch |
| Controller Type | Push Button |
| Country of Publication | China |
| Customer Reviews | 4.1 4.1 out of 5 stars (866) |
| Filter Type | HEPA Filter |
| Finish Types | Polished |
| Form Factor | Stick |
| Global Trade Identification Number | 10622356647462 |
| Included Components | Charging Dock |
| Indoor Outdoor Usage | Indoor |
| Is Product Cordless | Yes |
| Item Dimensions L x W x H | 36.4L x 26.3W x 73.3H centimeters |
| Item Type Name | Clean & Empty – Lightweight Cordless Vacuum Cleaner with HEPA Filter, Powerful Suction, Portable, Rechargeable, Auto-Empty System, Stick Vacuum for Pet Hair, Carpets & Hardfloor, White BU3521 |
| Item Weight | 5.1 kg |
| Manufacture Year | 2024 |
| Manufacturer | SharkNinja |
| Manufacturer Warranty Description | 5 Years Warranty |
| Model Name | Clean & Empty |
| Model Number | BU3521 |
| Motor Horsepower | 0.32 horsepower |
| Number of Handles | 1 |
| Number of Items | 1 |
| Number of Power Levels | 2 |
| Other Special Features of the Product | Cordless, HEPA, High Precision Sensors, Lightweight, Spotless Cleaning |
| Portable | Yes |
| Power Source | Battery Powered |
| Recommended Uses For Product | carpeted floors, hardwood floors, pet hair removal |
| Runtime | 40 minutes |
| Style Name | Auto-Empty Stick Cordless Vacuum Cleaner |
| Surface Recommendation | All floors |
| UPC | 622356647465 622356309783 |
| Unit Count | 1.0 Count |
| Voltage | 120 Volts |
| Wattage | 180 watts |
A**A
Great cordless vacuum!
I am very happy with my recent purchase! It's incredibly light and easy to use. I particularly appreciate how it automatically adjusts its power based on whether I'm cleaning a floor or carpet. What I love most is the stand station. It's so convenient not having to fix it to the wall, and the auto-cleaning feature is a fantastic bonus. Beyond these features, the 5-year warranty speaks volumes about the quality of this product. I absolutely recommend it!
A**S
Should have purchased this long ago.
Should have purchased this long ago. Really happy with the options. The self cleaning or dust extraction is really a game changer.Wow.
J**A
Don’t waste your time and money
As a user of proper vacuum cleaners I was skeptical about cordless vacuum cleaners. Unfortunately my experience proved true. As soon as I got it I tried to vacuum a strand of hair and wouldn’t come. I felt like I am holding a fan not a vacuum. I tried vacuuming the tiles, I had to go over the piece of crumble four times to pick it up. Then I tried to vacuum my carpet, the vacuum showed red light and shut off and the battery which was full became zero. This is a toy not a vacuum.
B**A
Auto clean not working after 2 months
The auto clean stop working after 2 months :(
H**Y
Love it.
Great for a small 1 or 2 bed place. Feels solid in the hand, powerful enough on light rugs and tiled/wooden floors. I love the self clearning function. My only niggle, I wish the base station had space for the 2 extra heads you get.
S**.
Amazing same as description.Work perfect very light but same time very strong
J**Z
Excelente, muy buena potencia y eficiencia.
J**H
I have always been a Shark enthusiast but now I am officially a self emptying convert. This vacuum has completely changed my cleaning routine. It’s so lightweight and easy to grab for quick messes, but the "Auto-Empty" system is the real game-changer. I used to hate the cloud of dust that happened every time I emptied my old vacuum, but this takes care of all of that for me. It picks up hair and desert dust from my Tucson floors effortlessly. No cords to trip over, no bags to mess with—it’s worth every single penny.
T**Y
This vacuum works really well and motivates me to clean my hardwood floors more often. I’ll start by saying this vacuum was such a welcome surprise to my previous one. I bought this to replace an all in one mop vacuum combo from another brand that really delivered poor performance so this one totally outshined the competition. 1) it’s really powerful. I can vacuum multiple times in the same day and it will still collect stuff and it’s chamber that will impress you to see how clean it’s keeping your floors. 2) great battery life. I absolutely love that. I can just keep it on. It’s charging stand, which means that I can pick it up anytime quickly and easily and I know it’s going to be charged and ready to go. When I’m done, I just put it back on its charger. 3) the self cleaning function!! I wasn’t looking for a vacuum with the self cleaning function so that was just an added bonus. I really didn’t think I would care about it, but it is SO NICE TO HAVE. Having a vacuum with a self cleaning function that empties the dust bin for you means that anytime you want to vacuum you simply pick it up off the charger and when you’re done? You simply put it back on the charger, that’s it! It makes it so quick and easy to vacuum (and bonus it’s pretty fun to watch) which means I vacuum more frequently and actually look forward to doing it! 4) the roller brush doesn’t trap hair, thank GOD. I truly despise dealing with hair that isn’t on my head it just grosses me out. I also have 3 pets so not having to deal with cutting hair out of a brush after vacuuming is a literal godsend. 5) pivots from hardwood floors to rug easily. It has an auto detect feature that will automatically increase the suction power when on a rug, which is really nice. 6) the buttons for the attachments feel really nice to click on and off. You know when you have a cheaper product and you feel like you’re almost going to break it to click something or push a button? This is easy to put on and take off attachments and feels like it’s nicely made. And it was a big plus for me that it has a handheld feature that can be removed for vacuuming things like the couch or car. 7) it has three suction power modes; Eco regular and a turbo mode, which gives you more control on battery life if you need it to last a little bit longer but don’t need quite as much suction power. My space is only about 1200 ft.² so I’ve had no issue with battery life. Some constructive feedback I would like to include: 1) it would be nice if it could stand up on its own 2) it can’t lay totally flat, though it can go pretty low and get a little ways underneath the bed 3) Lastly, Shark, can we talk about the aesthetic of this thing? I’m not going say that us women are the only ones vacuuming out here but a lot of women are going to be buying this product and we do not want a vacuum that looks like a drill handle 😂 I was honestly very put off by the way this looks when I first saw it, but the functionality of it made it worth it. I would LOVE to see a nicer looking handle for the future.
A**D
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