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Shark Clean & Empty Cordless Stick Vacuum & Auto-Empty System with PowerFins Brushroll White BU3521: Bagless, 40 Min Run Time
$229.99 reg $399.99
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save $170.00 (43% off)In Stock
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About this item
Highlights
- AUTOMATICALLY CHARGES & EMPTIES AFTER EVERY CLEAN: Return the vac to its charging dock, where it automatically empties into the base. After every clean: no more dirt on your hands, no more dust clouds in your home, no more cleaning after you clean.
- LIGHTWEIGHT MANEUVERABILITY: The redesigned cordless vacuum is 30% lighter vs. Shark® Vertex® Pro.
- REMOVABLE HANDVAC: Transforms into handheld vacuum for lightweight above floor cleaning.
- UP TO 40 MINUTES OF RUNTIME*: Deep clean your whole home with up to 40 minutes* of runtime. (*In ECO mode, measured at the hand vacuum.)
- UP TO 500X LESS DUST EXPOSURE** VS. TRADITIONAL EMPTYING: Fine dust and debris get sealed away after every clean, keeping them out of the air you breathe-- no more dust clouds. (*Based on third party-plume testing while emptying vs. Shark® Navigator® upright manual empty US/CAN NV130.)
- HEPA FILTRATION AND ANTI-ALLERGEN COMPLETE SEAL: Captures and traps over 99.97%* of dust and allergens. (*Based on ASTMF1977, down to .3 microns. Allergens refers to non-living matter.)
- AUTO-ADJUSTS TO FLOOR TYPES: Auto-adjusting & Multi- surface brushroll, optimizes brushroll speed for deep carpet cleaning and directly engages hard floors.
- QUIET MODE: Provides the option to dock & charge silently, and leave the emptying for later.
- LED HEADLIGHTS: Powerful LED lights on the nozzle reveal hidden debris around your home.
Description
Meet the new Shark Clean & Empty Cordless Stick Vacuum Cleaner & Auto-Empty System. Clean & Empty features a redesigned 1.3L auto-empty base and a lightweight design for versatile cleaning. With the auto-empty system, cleaning convenience is optimized; Always Charged, Always Empty & ready for the next clean. Inside the base, fine dust and debris is captured after every clean, leaving them out of the air you breathe- Up to 500x less dust exposure*. (*Based on third party-plume testing while emptying vs. Shark® Navigator® upright manual empty US/CAN NV130.) Clean & Empty has up to 40 minutes of runtime* (*in ECO mode, measured at the hand vacuum) with nozzle technology to auto-adjust to floor type, optimizing brushroll speed for deep carpet cleaning. The Powerfins® multi-surface brushroll gives you continuous cleaning contact to dig deep into carpets & directly engage hard floors with self-cleaning brushroll technology allowing for no hair wrap.
Dimensions (Overall): 43.5 Inches (H) x 10.43 Inches (W) x 14.69 Inches (D)
Weight: 11.24 Pounds
Features: Converts to Handheld, Cordless, Self-Cleaning Brushroll, Headlight, Rechargeable, Anti Allergen Seal
Capacity (Volume): 1.3 Liter
Model #: BU3521
Run Time: 40 Minutes
Wattage Required: 180 Watts
Number of Speeds: 2
Bag Type: Bagless
Cleaning Path Width: 10.43 Inches
Recommended Surface Application: Hardwood, Hard Floor, Multi-Surface, Carpet
Filter Type: Foam
Hose Length: 0 Inches
Power Source: Battery
Battery: 1 Non-Universal Lithium Ion
Warranty: 5 Year Limited Warranty. To obtain a copy of the manufacturer's or supplier's warranty for this item prior to purchasing the item, please call Target Guest Services at 1-800-591-3869
TCIN: 90571476
UPC: 622356647465
Item Number (DPCI): 329-00-5466
Origin: Imported
If the item details aren’t accurate or complete, we want to know about it.
Shipping details
Estimated ship dimensions: 28.8 inches length x 14.3 inches width x 10.4 inches height
Estimated ship weight: 18 pounds
We regret that this item cannot be shipped to PO Boxes.
This item cannot be shipped to the following locations: American Samoa (see also separate entry under AS), Guam (see also separate entry under GU), Northern Mariana Islands, Puerto Rico (see also separate entry under PR), United States Minor Outlying Islands, Virgin Islands, U.S., APO/FPO
This item ships in its manufacturer’s packaging, revealing what’s inside. ·
Return details
This item must be returned to any Target store.
This item must be returned within 90 days of the date it was purchased in store, shipped, delivered by a Shipt shopper, or made ready for pickup.
See the return policy for complete information.
Q: How does the dirt in stationed receptacle get emptied? Are there bags involved?
submitted by Kstas4 - 4 months ago
A: The dock dust bin holds up to 30 days of dust. When the full indicator light turns on, remove the bagless bin by lifting it by the handle. To dispose of the contents, hold it over the trash and press the side release button to let the debris fall out.
submitted bySharkNinja Product Expert - 4 months agoBrand expert
Q: Can the battery be removed andcharged on its own
submitted by PRETTY GOOD - 10 months ago
A: The battery is removable, but it can only be charged in the vacuum. To charge the battery, place your vacuum on the Auto-Empty Dock. A full charge takes approximately 5 hours. Leaving the unit plugged in will not damage battery life.
submitted bySharkNinja Product Expert - 9 months agoBrand expert
Q: Do you need to hold the "trigger" on the base constantly? - or do you hit a power button and that's all.
submitted by ionicbond007 - 11 months ago
A: Power on button and that's all. Amazing!!
submitted byionicbond007 - 4 months agoA: Press the button on the control panel on the back of the handheld vacuum to turn on power. To turn off power, press the button again.
submitted bySharkNinja Product Expert - 10 months agoBrand expert
Q: how many batteries does it come with
submitted by tom taylor - 1 year ago
A: Battery: 1 Non-Universal Lithium Ion, Required, Included
submitted byLmurphy418 - 1 year agoA: The Shark comes with one removable rechargeable battery.
submitted bySharkNinja Product Expert - 11 months agoBrand expert
Q: Via the photo I do not see this vacuum is built with EDGE DETECT. Please confirm.
submitted by Where are the chips - 1 month ago
A: You're absolutely right to question that, based on the available product documentation and feature listings, the Shark Shark Clean & Empty Cordless Stick Vacuum does not appear to include Edge Detect technology. That feature is typically found in Shark’s PowerDetect lineup, which uses sensors to detect edges and adjust suction accordingly.
submitted bySharkNinja Product Expert - 1 month agoBrand expert
Q: do you have to change the filter
submitted by TW - 1 month ago
A: Hello there, Thank you for your question! Both the pre-motor and post-motor filters will eventually need to be replaced. The pre-motor filter can be washed and air-dried for up to 48 hours, and only needs replacing when it shows visible wear. The post-motor filter should be replaced once a year. For best performance, tap off loose dirt between washes.
submitted bySharkNinja Product Expert - 1 month agoBrand expert
Q: Can this be used on carpet or only hardwood floors?
submitted by Anonymous - 1 month ago
A: Hello there, Thank you for taking the time to ask such a great question! Yes, this unit can certainly be used to clean both carpet and hardwood floors. It’s designed to handle a variety of surfaces, making it a versatile choice for your cleaning needs.
submitted bySharkNinja Product Expert - 1 month agoBrand expert
Q: Is assembly required when purchased?
submitted by MamaJ - 2 months ago
A: Yes, the vacuum needs simple assembly; just snap the parts together. No tools required.
submitted bySharkNinja Product Expert - 2 months agoBrand expert
Q: Is there assembly required
submitted by MamaJ - 2 months ago
A: Yes, the Shark BU3251 vacuum needs simple assembly; just snap the parts together. No tools required.
submitted bySharkNinja Product Expert - 2 months agoBrand expert
Q: Does this vacuum stand up in position on its own?
submitted by Junkyjunkgirl - 2 months ago
A: No, this vacuum does not stand up on its own. You’ll need to either lean it against a wall or place it on its docking station for storage
submitted bySharkNinja Product Expert - 2 months agoBrand expert
WARNING:Cancer and Reproductive Harm—www.P65Warnings.ca.gov For more information, go to https://www.p65warnings.ca.gov/
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Guests are saying
The Shark cordless vacuum offers a powerful and convenient cleaning experience with its auto-empty feature, making it ideal for quick cleanups. Guests appreciate its lightweight design, maneuverability, and ability to transition between different floor types seamlessly. While some have noted durability concerns and average suction power, many find it effective for daily use, especially in homes with pets. Overall, it stands out for its innovative features and ease of use, making it a worthy investment for any household.
Summary created by AI from text of reviews reflecting recent feedback provided across different star ratings (includes incentivized reviews)
4.3 out of 5 stars with 215 reviews
53% would recommend
15 recommendations
2 out of 5 stars
Thumbs down graphic, would not recommend
28 October, 2025Verified purchase
Dust cup leaks crumbs
I like the self empty feature, but that’s about it. The dust cup on the back constantly leaks because it doesn’t shut all the way. Pet hair gets clogged. Way too expensive for the quality. I am returning.
3 out of 5 stars
26 October, 2025
originally posted on sharkninja.com
Light Weight - Could use Improvements
The vacuum is light weight and easy to get around. Hate it locks back up when vacuum if get it more upright (hello, we pull it to ourselves) and then have to put you foot back on it to click the unit back to the ground to continue vacuuming. Still not sure what the “hook” if for nor where the second attachment is to sit as a space for one specific one only and they don’t “seat” onto each other. I feel like I need to get another vacuum for carpets tho too. I might have been able to spend less for same options for a different model or brand? Do like it comes apart to be a replacement for my little one too (which I had already replaced tho) and that it automatically clears itself. Haven’t tried to empty it yet.
3 out of 5 stars
26 October, 2025
originally posted on sharkninja.com
Natural and honest
I bought this vacuum a few months ago. It’s just okay because I have to go over the same area several times to get a clean surface. The extra cleaning attachment that came with it doesn’t work at all — the suction is very weak. When trying to clean narrow spaces, the attachment doesn’t do a good job, so I basically only use the main vacuum. For the price, it’s really not worth the cost.
1 out of 5 stars
22 October, 2025Verified purchase
Arrived used
Arrived used so I returned and bought from another retailer that sold in the store. So far I like the design. I also have a shark vertex and a corded shark. I like the auto empty. It’s like a modern version of central vac.
1 reply from SharkNinja Product Expert team - 10 days ago
Hello there, Thank you for sharing your experience. We’re glad to hear you’re enjoying the design and features so far. The auto-empty function really does bring a modern convenience and it’s great to hear it’s working well for you. If you ever need support or have questions about your Shark products, feel free to reach out to us at 1-855-427-5127. Our product specialists are available Monday to Friday, 9 a.m. – 9 p.m. ET, and Saturday, 9 a.m. – 6 p.m. ET, and will be happy to help! Kind regards, Shark Clean
5 out of 5 stars
Thumbs up graphic, would recommend
18 October, 2025
Well worth the money!
This is THE BEST vacuum! It works great, changes from tile, to wood to carpet so easy! I also love the hands free debris empty suction it does! I cannot say enough good about it!
5 out of 5 stars
Thumbs up graphic, would recommend
18 October, 2025Verified purchase
Worth the money!
I bought it for 250$ and it's worth every cent! I'm glad I bought it! Automatic-empty is fire. The suction is powerful and the battery is durable.
3 out of 5 stars
Thumbs up graphic, would recommend
15 October, 2025Verified purchase
(no review title)
ordered online and received it timely. opened the box and discovered it was used. I had to drive 30 miles for a replacement. The vacuum works great though.
1 reply from SharkNinja Product Expert team - 17 days ago
Hello Joe, thank you for bringing this to our attention. Please accept our sincere regrets for the oversight in your order. This isn’t our usual standard, and we truly appreciate how frustrating it must have been to receive a used product, especially after having to drive 30 miles for a replacement. We’re glad to hear that the vacuum is working great now, and we appreciate your patience and understanding throughout this experience. Your feedback is incredibly valuable and will be shared with our team to help prevent similar issues in the future. Kind regards, Shark Clean
5 out of 5 stars
15 October, 2025
originally posted on sharkninja.com
The best!
I absolutely love this vacuum!! Love the self empty option! This was on sale and I got it for an amazing price!!
5 out of 5 stars
13 October, 2025Verified purchase
(no review title)
I have been eyeing this vacuum for awhile now. Finally purchased it and happy I did. It works great, light weight and gets the job done!
1 out of 5 stars
10 October, 2025
originally posted on sharkninja.com
Horrible
I can’t vacuum on carpet. It leaves dog hair all over the place. I bought this because it auto empties but even that doesn’t work sometimes! I’ve contacted Shark 3 times with no resolution!
1 reply from SharkNinja team - 20 days ago
Hello, Thank you for taking the time to leave a review. We're so sorry about the trouble you’ve had with your vacuum. We completely understand how frustrating it must be when a product doesn’t perform as expected, especially when it comes to something as important as cleaning up pet hair. It’s also very concerning to hear that the auto-empty feature isn’t working consistently. Please reach out to our team by phone at 1-855-427-5127, we'd be happy to look into this for you. Kind regards, Shark Clean
1 out of 5 stars
29 September, 2025
originally posted on sharkninja.com
(no review title)
Absolute garbage. Clogs literally every 5 minutes, cannot handle even a little bit of animal hair or dust. Do not buy this thing. You’re better off with a broom.
1 reply from SharkNinja team - 1 month ago
Hello, Thank you for taking the time to leave a review. We're so sorry to hear the vacuum hasn’t performed as expected, especially with frequent clogging and difficulty handling pet hair and dust. Please reach out to our team by phone at 1-855-427-5127, we'd be happy to look into this for you. Our hours of Operation: Monday-Friday 9am - 9pm EST | Saturday 9am - 6pm EST. Kind regards, Shark Clean
1 out of 5 stars
29 September, 2025
originally posted on sharkninja.com
Battery stopped charging
Battery is dead after a year. It just wouldn’t charge and the removable battery just blinks over and over. I tried to disconnect everything and make sure everything was clean and none of that worked. You can’t buy just the battery on their website. It’s not the best vacuum for carpet but I have all hard floors other than door rugs.
1 reply from SharkNinja team - 1 month ago
Hello Alexis, Thank you for taking the time to leave a review. We're so sorry to hear hear that your vacuum’s battery stopped charging after just a year. Please reach out to our team by phone at 1-855-427-5127, we'd be happy to look into this for you. Our hours of Operation: Monday-Friday 9am - 9pm EST | Saturday 9am - 6pm EST. Kind regards, Shark Clean
5 out of 5 stars
Thumbs up graphic, would recommend
27 September, 2025Verified purchase
Great Vacuum
This is a great vacuum. I purchased add a gift for someone and they loved it. It has a suction feature once it’s home back into its port. Great buy
5 out of 5 stars
13 September, 2025
originally posted on sharkninja.com
Best Shark
This electric broom is absolutely the best! I bought a different brand three months ago and regret not choosing this Shark broom sooner. I urge everyone to invest in this—it’s worth every penny!
1 out of 5 stars
8 September, 2025
originally posted on Shark Ninja ANZ
Dyson is a lot more durable
Had this vacuum a month, I leant it again the kitchen bench and it slowly slid down and hit the ground and the whole handle snapped off. My Dyson would fall all the time and never had any damage, this vacuum is too fragile not durable
1 out of 5 stars
Thumbs down graphic, would not recommend
2 September, 2025Verified purchase
Dont buy this
This item broke within one month of opening the box. The cords are falling out from the attached handle vacuum part and since the return window is closed they won’t do anything about it
1 reply from SharkNinja Product Expert team - 2 months ago
Hi dear customer, Thank you for taking the time to share your experience with the Shark Clean & Empty Cordless Stick Vacuum. We're very sorry to hear that the unit developed an issue so soon after purchase and that your experience with the return process was frustrating. We’d like the opportunity to assist you directly and explore warranty options. Please contact our Customer Care team at 1-855-427-5127 so we can gather more details and work toward a resolution. Kind regards, Shark Clean
5 out of 5 stars
23 August, 2025
originally posted on sharkninja.com
Best Cordless Vac Ever!!
My first purchase was a Shark corded stick vac....loved it! Wanted something for quick cleanups so bought a a cordless stick that I love. I wanted something a bit more substantial and one that I didn't have to empty when I did a quick vacuum before I left for work. This vac is perfect! I don't have to change from hard floor to carpet, it has a handheld feature, and it empties itself! I am keeping the other cordless vac, but it's used for our covered, screened patio porch only. I also have a Shark steam cleaner for my tile floors. I love all my Shark products!!
2 out of 5 stars
20 August, 2025
originally posted on sharkninja.com
Overpriced and Underwhelming
This vacuum is honestly just okay and nothing impressive. I bought it for quick daily cleanups with pets, and while the auto-empty feature is convenient, it’s really the only thing that stands out, and even that would be better if it had the option for a scented filter like some of the other models. The suction is average, the handle feels flimsy, and the build quality overall comes across as cheap. It does include a pet tool, but it feels so basic and poorly made that it doesn’t add much value. What’s frustrating is that Shark doesn’t standardize attachments across their models, leaving some versions with limited or downgraded options. No motorized hand tool, no scented filter, and very little flexibility with add-ons. For the cost, I expected much more. At the end of the day, it does the job, but there’s no wow factor, nothing impressive, and definitely not the level of quality I would expect from Shark
1 reply from SharkNinja team - 2 months ago
Hi Erin, Thanks so much for your honest feedback. We're sorry to hear the vacuum didn’t meet your expectations. We appreciate you pointing out what worked and what didn’t, especially regarding the attachments and build quality. Your input helps us improve, and we’ve shared it with our product team. If there’s anything we can do to support you further, please don’t hesitate to reach out. You can reach us via phone at 1-855-427-5127.Our hours of operation are Monday to Friday, 9:00 a.m. to 9:00 p.m. ET, and Saturday from 9:00 a.m. to 6:00 p.m. ET. Kind regards, Shark Clean
1 out of 5 stars
Thumbs down graphic, would not recommend
18 August, 2025Verified purchase
Do not recommend.
I am so confused by the positive comments. This vacuum has a little bin area that collects sand / dust and you CANNOT clean it. Look into it because it’s a constant complain. Another complaint I missed was the magnet on the back after it self empties does not close so every-time you vacuum you have to close it. It has opened while I was vacuuming and everything came out from the back. Target accepted the return and refunded me because it was less than 30 days. Target gets my 5 stars on customer service but Shark clean & empty vacuum 0 stars.
1 reply from SharkNinja Product Expert team - 2 months ago
Hi Karina, Thank you for taking the time to share your experience with the Shark Clean & Empty Cordless Stick Vacuum. We’re sorry to hear that the bin design and magnet closure did not meet your expectations and impacted your overall use of the vacuum. We understand how frustrating that must have been and appreciate you highlighting these concerns. Your feedback is being shared with our product teams as we continually work to improve both function and design. If you have any additional questions or would like to discuss this further, please feel free to contact our Shark Customer Service team at 1-855-427-5127. Kind regards, Shark Clean
5 out of 5 stars
18 August, 2025
originally posted on sharkninja.com
Fantabulous product
This is much better than my dyson. It's much lighter and easier to maneuver.