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Internet # 330507762

Model # BU3521

Store SKU # 1011870150

Clean & Empty Self Cleaning Brushroll, Bagless, Cordless, HEPA Filter, Stick Vacuum & Auto-Empty System for Multisurface

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Product Details

About This Product

Meet the new Shark Clean & Empty Cordless Stick Vacuum & 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 Ready, Always Charged, Always Empty & ready for the next clean. Inside the base, fine dust and debris get sealed away after every clean, leaving them out of the air you breathe-500x less dust exposure*. (*Based on third party-plume testing while emptying vs. upright manual empty (US/CA: NV130). Clean & Empty has up to 40 minutes of runtime 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.


  • ALWAYS READY, ALWAYS CHARGED: Automatically empties and charges while docked, so it's ready for the next clean. No more manual emptying after every clean.
  • LIGHTWEIGHT MANEUVERABILITY: The redesigned cordless vacuum ins 30% lighter*, with the power and performance of a full-sized** Shark cordless vacuum (*vs. IZ662H.) (**Based on ASTMF608, vs. IZ662H)
  • 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.)
  • 500X LESS DUST EXPOSURE** VS. TRADITIONAL EMPTYING: Fine dust and debris get sealed away after every clean, keeping them out of the air you breahe-- no more dust clouds. (**Based on thirs-party plume testing while emptying vs. manual empty.)
  • HEPA FILTER AND ANTI-ALLERGEN COMPLETE SEAL: Captures and traps over 99.97%* of dust and allergens. (*Based on ASTMF1977, down to .3 microns.)
  • AUTO-ADJUSTS TO FLOOR TYPES: Auto-adjusting & MultiSurface 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.
  • 8" Duster Crevice Tool, Pet-Multi tool
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Product Information

Internet # 330507762

Model # BU3521

Store SKU # 1011870150


Dimensions: H 43.5 in, W 10.43 in, D 14.69 in


Product Depth (in.)

14.69 in

Product Height (in.)

43.5 in

Product Width (in.)

10.43 in


Amperage (A)

25 A

Appliance Category

Floor Care

Appliance Series

Not Applicable

Bag Type


Battery Life (Max)

40 Minutes

Brush Bristle Type

No Brush Bristle

Brush Included


Bundling Options

Tool Only





Detachable Battery


Filter Type

HEPA Filter

Floor Care Features

Adjustable Suction, Auto Docking/Recharging, Convertible to Handheld, Headlights

Floor Cleaning Type


Included Accessories

Crevice tool, Pet Grooming Tool



Noise Level (dB)


Number of Attachments


Number of Batteries Required


Product Weight (lb.)

11.24 lb

Recommended Surfaces




Sound Rating Range (Decibels)


Stick Vacuum Type


Voltage (v)


Warranty / Certifications

Certifications and Listings

UL Listed

Manufacturer Warranty

5 year limited base

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

4.8 out of 5

  • 4.8 out of 34 reviews
  • 100% recommend this product
Filter by:
Showing 1-10 of 34 reviews
Quiet but powerful
[This review was collected as part of a promotion.] This vacuum is just perfect. This is the one I grab when I need to do a quick vacuum. This grabs the dog hair off the floors and the carpet. It works on rugs as well. It even has a light so you can see what you are doing. The noise level is next to nothing, so it doesn't make my Mom's dog go crazy. I love the self emptying action. The collection bin holds a decent amount. The battery life is pretty good as well. I can do my living room, hallway, kitchen, and utility room areas and still have most of the battery left. By far, it's one of the best stick vacuums I've used.
    Best one for 2024
    [This review was collected as part of a promotion.] This is the best vacuum cleaner for 2024. The auto-empty system and self cleaning brush roll is the best feature that I could wish for. It has the strong suction on the floor and on the carpet. It automatically detects carpet and use high power. It is lightweight and easy to maneuver. It is loud but the work it does is remarkable. When you place back it on its stand it empties is small canister and all the trash goes in the bin which is attached to its home.
      [This review was collected as part of a promotion.] I’m so incredibly lucky to have gotten this! This is my new favorite gadget. It picks up so much hair in such a small time! It’s extremely strong when vacuuming normally and I love it. My only issue is how fast it fills. I have 2 dogs so it’s a lot of hair so I’m stopping more often but still worth it!
        Kinda not worth the money
        I have always liked shark products hair products. This shark vacuum keeps switching from hard floor to carpet when I'm trying to vacuum my carpet. I put in on the boost and it drains the power so fast. I have also tried to figure out how to clean the triangle shaped sand/dirt trap inside the clear big dirt collector. Very disappointed.
        Response from SharkNinjaMay 28, 2024
        Hello, Thank you for taking the time to leave a review. We're so sorry to hear that you aren't happy with your Shark® Clean & Empty Cordless Stick Vacuum. We will absolutely share your feedback with the relevant teams for consideration on future products. If you need any help with your product, please don't hesitate to reach out to our team by phone at 1-855-427-5127. Kind regards, Shark Clean
          [This review was collected as part of a promotion.] The vacuum cleaner has made it easier for me to clean in areas where it is not so accessible to clean. Apart from that, it is perfect because it is cordless which makes moving with it easier. I recommend it 100% if you are looking for something practical and effective.
            Makes cleaning easy
            [This review was collected as part of a promotion.] Thank you for allowing me to test this awesome product! The process of putting the Shark cordless vac together was simple. I thought I might have to charge it,but it worked right out of the box. The suction is strong,and it won't miss a crumb,cobweb,or pet hair. Its light weight,and i noticed the sound didn't make my cats run for their lives which was a plus,but the most amazing part is when you dock it and it cleans itself!! Wow!! I love it!!
              This Vacuum really SUCKS… in the best way possible
              [This review was collected as part of a promotion.] I really love this Shark Vacuum. I’m no stranger to the brand and I can say that this vacuum really SUCKS, lol. The suction power in this model is incredible. It sucked up dirt I didn’t even know I had which was impressive. I really like the fact that the vaccum has its own auto empty system and cleans itself out. I will say when the dirt compartment is very packed and overfilled it might not empty into the auto empty base fully on the first time… but it’s no big deal to me. I just remove it and place it on the base again and it sucks out all the dirt. The light on the vacuum is awesome so you can actually see what you are vacuuming. My only complaint is that the vacuum is a little awkward to hold since the handle and battery are somewhat heavy but it’s really not a big deal at all. Overall I can’t ask for a better, more portable vacuum that helps me get my cleaning done quickly.
                Perfect household stuffing
                [This review was collected as part of a promotion.] This one has opened my mind. First, it looks fancy in white, that makes the house brighter. Second, the suction power is strong and can use on many different things as floor or mat… plus, it is noiseless, and love the dust storage which is can auto suck out the dust from the vacuum.
                  Empties Dust For You!!
                  [This review was collected as part of a promotion.] Oh my gosh. I cannot believe how cool this vacuum is. It empties the dirt for you!! It’s not loud, charge lasts, and it’s not heavy! I am very impressed
                    Accelerated suction
                    [This review was collected as part of a promotion.] I received this Shark Clean & Empty Cordless Stick Vacuum & Auto-Empty System as a compliment from Influenster for testing purposes. This Shark is lighter with hyper velocity accelerated suction power and its performance like a full-size cordless. It includes duster crevice tool and pet multi tool. It charges and empty after every clean. The auto-empty system is a plus for this vacuum however I gave it a 4 stars due to not practical and the power button location is not convenient to turn on. Otherwise it is a very good vacuum.
                      Showing 1-10 of 34 reviews

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                      Amperage (A)

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                      Floor Care Features

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                      Battery Life (Max)

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                      Recommended Surfaces


                      Carpet, Hardwood/Wood Laminate, Multisurface


                      Carpet, Hardwood/Wood Laminate, Marble, Multisurface, Tile, Upholstery