Sponsored
Shark Clean & Empty Cordless Stick Vacuum & Auto-Empty System with PowerFins Brushroll White BU3521: Bagless, 40 Min Run Time
$259.99 reg $399.99
Sale save $140.00 (35% off)
In Stock
Eligible for registries and wish lists
At a glance
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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: Cordless, Converts to Handheld, 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, Required, Installed
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 - 5 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 - 5 months agoBrand expert
Q: Can the battery be removed andcharged on its own
submitted by PRETTY GOOD - 11 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 - 11 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 - 1 year ago
A: Power on button and that's all. Amazing!!
submitted byionicbond007 - 6 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 - 11 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 - 1 year agoBrand expert
Q: Does this vac pick up debris in the pull back reverse roll or just in forward push position?
submitted by SleepyMom - 10 days ago
A: Yes, the Shark BU3521 vacuum is designed to pick up dirt and debris effectively in both forward and backward motions.
submitted bySharkNinja Product Expert - 7 days agoBrand expert
Q: What is the airflow or CFM?
submitted by Tahletha - 19 days ago
A: While we don’t measure airflow or CFM, we can provide the Wattage which is 240 and the Voltage which is 21.6.
submitted bySharkNinja Product Expert - 15 days agoBrand expert
Q: What is the difference between BU 3521 and B 3523
submitted by hulagirl - 19 days ago
A: There is no difference in functionality as both units belong to the same series, however, the BU3523 includes a motorized pet power tool, while the BU3521 comes with a standard pet multi-tool.
submitted bySharkNinja Product Expert - 19 days agoBrand expert
Q: Will this vacuum scratch LVT floors?
submitted by CW - 20 days ago
A: The unit is safe for LVT floors and is not expected to scratch them when used as intended. It does not have a dedicated hard floor mode, but its auto-adjusting PowerFins® brushroll is designed to clean multiple surfaces, including hard floors, without manual adjustments.
submitted bySharkNinja Product Expert - 20 days agoBrand expert
Q: How much for a new battery?
submitted by Bearly - 25 days ago
A: You can find the cost of a replacement battery by searching for “Shark BU3521 battery.” If you’re unable to locate one, please contact Shark Customer Support at 1-855-427-5127 (Mon–Fri: 9 AM–9 PM ET, Sat: 9 AM–6 PM ET).
submitted bySharkNinja Product Expert - 25 days agoBrand expert
Q: CSusanan this vacuum be used on carpet as well as hardwood?
submitted by Susan - 1 month ago
A: Yes, the Shark BU3521 Clean & Empty Cordless Stick Vacuum can be used on both carpet and hardwood floors.
submitted bySharkNinja Product Expert - 1 month 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)
4.2 out of 5 stars with 241 reviews
54% would recommend
24 recommendations
2 out of 5 stars
15 December, 2025
originally posted on sharkninja.com
Not too happy.
I like the auto-empty feature, but this vacuum does not have great suction on hard floors, and especially on carpet. If I hadn't already trashed the box it came in, I would return it for a refund. Not too happy Shark.
1 reply from SharkNinja team - 3 days ago
Hi there, Thank you for sharing your feedback. We regret that the vacuum isn’t performing as expected on hard floors and carpet. Something doesn’t seem right, and we’d like the opportunity to review this with you and find the best solution. Please give us a call at 1-855-427-5127. Our team is available 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 US.
3 out of 5 stars
15 December, 2025
originally posted on sharkninja.com
So close to being great
Works in one direction fairly well. I like that it is cordless. Battery power length is so so. The filter where debris flows into the system is always clogged before the actual compartment is full. This leads to multiple trips to the base to clear it out. The attachment clip doesn’t actually hold any of the attachments. It is inconvenient to have to hold them while cleaning.
1 out of 5 stars
11 December, 2025Verified purchase
Horrible Target customer service!
This review is of Target’s service not the vacuum. Was shipped the wrong vacuum after using Cyber Monday deals. Target corporate customer service and local store’s response to their error was to return the vacuum model sent by them, refund amount paid and have me purchase the originally ordered model at higher price as cyber discounts were no longer in place. Long time red card holder very disappointed in Target.
1 reply from SharkNinja Product Expert team - 6 days ago
Hi Melinda, Thank you for sharing your experience. We understand how frustrating it must have been to receive the wrong item and then be asked to repurchase at a higher price after Cyber Monday discounts had ended. That’s not the level of service anyone should expect. Since this issue relates to Target’s ordering and pricing policies, we recommend reaching out to Target’s Customer Service for further assistance. They may be able to review the situation and help. Your feedback will also be shared with the appropriate teams to highlight the importance of honoring promotional pricing when errors occur. Kind regards, Shark Clean
5 out of 5 stars
Thumbs up graphic, would recommend
11 December, 2025Verified purchase
(no review title)
Wife loves it. Likes the auto detect on it and the auto empty.
5 out of 5 stars
Thumbs up graphic, would recommend
10 December, 2025Verified purchase
(no review title)
That’s great for second vacuum cleaner
4 out of 5 stars
Thumbs down graphic, would not recommend
10 December, 2025Verified purchase
Really like this vacuum!
I'll say the "bad" first ; It was a little pricey due to the suction not being as strong as it probably should for that price. I use it to do a quick pick up everyday and it works well with battery life. It has only died on me once. I wish you could get extra batteries to swap out. I love the self emptying option as I didn't realize that feature until I brought it home. I keep this in my bedroom so I also really like that it has a night time option. When the moon button is pushed, the vacuum won't self empty.
1 out of 5 stars
9 December, 2025
originally posted on sharkninja.com
Cordless disappointment
Thank you for the cordless upgrade for free. However, I am not impressed with the performance as with my other Shark with the cord. Using the cordless, takes the convenience out of vacuuming, very time consuming, having to empty big areas often. Plus the unit doesn’t stand up alone, always need to lean it against something or lay it on the floor. Very disappointing. Personally, a very poor design and product.
1 reply from SharkNinja team - 8 days ago
Hi Cherie, Thank you for sharing your experience. It’s disappointing to hear that the cordless upgrade hasn’t met your expectations, particularly regarding convenience and design. We truly appreciate your feedback, as it helps us understand what matters most to our customers. Kind Regards, Shark Clean.
4 out of 5 stars
Thumbs up graphic, would recommend
7 December, 2025Verified purchase
Good vac but......
So far so good, i like the fact it empties itself and stays charged while being stored. we had our last shake tj stick vac for many years and it finally died. i hope this one lasts just as long.
5 out of 5 stars
6 December, 2025
originally posted on sharkninja.com
Luv how it changes from floor to rug instantly
Own a large Dyson vacuum decided I wanted a smaller VAC but didn’t want to pay Dyson price so I got a shark and I’m glad I did works great
4 out of 5 stars
2 December, 2025
originally posted on sharkninja.com
Auto Empty
I bought this vacuum to replace a Shark Navigator Lift Away. It's lightweight and does a good job vacuuming my laminate floors. I like the auto empty feature as it eliminates the dust and dirt from dispersing into the air. I tried using the vacuum as a handheld and found the suction power lacking and this is why I gave 4 stars.
1 out of 5 stars
Thumbs down graphic, would not recommend
1 December, 2025Verified purchase
Awful product
Broke after 1 month
1 reply from SharkNinja Product Expert team - 17 days ago
Hi Tara, Thank you for your feedback. We’re disappointed to hear your product broke after just one month of use. This isn’t our usual standard, and we understand how frustrating this must be. We’d appreciate the opportunity to make this right. Please contact our Shark customer service team at 1-855-427-5127, available Monday to Friday from 9 a.m. to 9 p.m. ET and Saturday from 9 a.m. to 6 p.m. ET, and we’ll do everything we can to assist you. Kind Regards, Shark Clean NA
5 out of 5 stars
Thumbs up graphic, would recommend
28 November, 2025Verified purchase
Worth the investment
Very impressive! - great suction power - extremely easy to clean the roller - spot for the attachments - self cleans the canister EVERY time (option to turn off this feature) If you have babies or animals, it’s worth the investment
3 out of 5 stars
27 November, 2025
originally posted on sharkninja.com
Suction is okay
I’ve had might for a bit now wanted to wait to give a fair review and I gotta say the design is nice and sleek I love that I don’t have to touch anything but a button to empty it but the battery never lasts anywhere near 40 minutes even with a full charge and the suction is just okay I definitely expected more out of it maybe I got a bum battery or something. Sometimes dirt will fall out of the vacuum while your carrying it back to the base but it’s good for a quick cleaning but definitely not deep cleaning quality if your a compulsive cleaner like I am. On the brighter not it is nice to look at lol
1 reply from SharkNinja team - 13 days ago
Hi Emmy, Thank you for sharing your honest feedback. We’re glad to hear you love the sleek design and the convenience of the auto-empty feature, but we’re sorry to learn about the battery life and suction concerns. That’s definitely not the experience we want for our customers. Battery performance can vary based on the cleaning mode and attachments used, but if you’re consistently seeing much less than 40 minutes, we’d love to help troubleshoot or review your warranty options. Please reach out to us at 1-855-427-5127 so our team can assist you. Thank you for bringing this to our attention, we truly appreciate your feedback and the chance to improve your experience. Sincerely, Shark Clean US
5 out of 5 stars
19 November, 2025
originally posted on sharkninja.com
New user
I love it vacums well just doesnt stay charged for my carpets! I try the reg button and it takes a lil to go to turbo that does better
4 out of 5 stars
17 November, 2025
originally posted on sharkninja.com
Great light-weight vacuum, battery isn't greatest
I love this vacuum, it's super light-weight, works well, except for the battery. If you at all use the more powerful suction, the battery doesn't last long at all and has to be recharged again. So really, my only complaint is that the battery life is not great. Other than that, I would recommend it.
5 out of 5 stars
Thumbs up graphic, would recommend
11 November, 2025Verified purchase
(no review title)
[This review was collected as part of a promotion.] So happy I made this purchase! Great suction for a stick vacuum
5 out of 5 stars
10 November, 2025Verified purchase
(no review title)
Better than any other brands
1 out of 5 stars
6 November, 2025
originally posted on sharkninja.com
Only works for a fee minutes after a few weeks
** update** Returning it as it dies within a few minutes, overheating or something, and it feels like the clip is going to break on disconnecting the top from the stick. 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.
1 reply from SharkNinja team - 2 months ago
Hi Lori, Thank you for sharing your experience with the Clean & Empty Cordless Stick Vacuum. We’re glad to hear you appreciate its lightweight design and maneuverability, but we’re sorry to hear about the frustrations with the locking mechanism and accessory storage. Your feedback is incredibly helpful. We’ve shared your comments with our product team for review. As for the hook and attachment storage, we’d be happy to clarify their intended use and help ensure everything is set up correctly.Please reach out to our team by phone at 1-855-427-5127, we'd be happy to look into this for you. Thank you again for choosing Shark and for your thoughtful review. We’re here to help make your experience better. Warm regards, Shark Clean US
1 out of 5 stars
Thumbs down graphic, would not recommend
5 November, 2025Verified purchase
Worst to vacuum I've ever purchased
By far the worst vacuum I’ve ever purchased. Does not pick anything up, I have to go over the smallest speck of dust or dirt three or four times to hope it picks it up. Spits dust and debris out from the canister and constant error messages.Has this horrible little filter inside that cannot be empty that trapped dust in dirt. Useless
1 reply from SharkNinja Product Expert team - 1 month ago
Hi there, Thank you for taking the time to leave a review. We’re truly sorry to hear that your vacuum didn’t meet your expectations and that you experienced issues with suction, debris, and error messages. We understand how frustrating this must be, and we want to help make things right. We kindly invite you to reach out to our Customer Service team 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
2 out of 5 stars
Thumbs down graphic, would not recommend
3 November, 2025
Disappointed
Wanted to love it, but I don’t. Was thrilled for the auto empty feature! Though, I end up having to manually empty it because hair gets clogged. The back opening does not shut like it should which causes small particles to leak out of the back after vacuuming. It also feels wobbly in the center of the “stick” as I am pulling and pushing the vacuum. Purchased this to have a vacuum on the bottom and top level of our home. I find that I am going upstairs to bring my Dyson down to finish the job.
1 reply from SharkNinja Product Expert team - 1 month ago
Hello, and thank you for your review. We’re disappointed to hear about your experience with the Shark BU3521. It seems like a very frustrating situation, and we understand how disappointing it must be to deal with issues like hair clogging the auto-empty feature, a back opening that doesn’t seal properly, and a wobbly stick design that affects usability. You even mentioned having to bring your Dyson from upstairs just to finish the job, which we would feel the same about in your situation. We’d like to help you. Please contact our customer service team at 1-855-427-5127, available Monday to Friday from 9 a.m. to 9 p.m. ET and Saturday from 9 a.m. to 6 p.m. ET. Your concerns have been noted, and we’ll take the appropriate steps to get this resolved. Kind regards, Shark Clean