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Description
Fitbit Flex Wireless Wristband with Sleep Function, BlackColor: Slate Size: Two wristbands included, Large (6. 5 7. 9 in) and Small (5. 5 6. 5 in) Product Description Fitbit FB401SL Flex Wireless Activity and Sleep Tracker Wristband From the Manufacturer Certain features like Auto Sleep Tracking and SmartTrack may be disabled when using this accessory. Classic accessory bands are the recommended accessory for high intensity workouts and sleep tracking. Do not wear the Flex 2 Pendant accessory while sleeping
Color:Slate | Size:Two wristbands included, Large (6.5 - 7.9 in) and Small (5.5 - 6.5 in)
Product Description
Fitbit FB401SL Flex Wireless Activity and Sleep Tracker Wristband
From the Manufacturer
• Certain features like Auto Sleep Tracking and SmartTrack may be disabled when using this accessory. Classic accessory bands are the recommended accessory for high intensity workouts and sleep tracking. • Do not wear the Flex 2 Pendant accessory while sleeping or during high intensity activity, as doing so could create a choking hazard. • Flex 2 Pendant accessories contain magnets. Magnets may interfere with pacemakers, defibrillators, or other medical devices. Consult your physician and the manufacturer of your medical device before using to determine if these accessories are safe for you. If the accessories may be interfering with your pacemaker, defibrillator, or other medical device, do not wear the accessories.
See all Product description- One syncs automatically and wirelessly to tablets, computers and 150+ leading iOS, Android and Windows smartphones using Bluetooth 4.0 wireless technology. Syncing to computers requires Internet connection and USB port. Syncing to mobile devices requires Bluetooth and Internet connection. Syncing range: 20 feet. Call notifications via Bluetooth 4.0
- Water Resistance: Charge has been tested up to 1 ATM meaning it is sweat, rain and splash proof. However, the device is not swim proof. We also recommend taking Charge off before showering because, as with any wearable device, it’s best for your skin if the band stays dry and clean
- Warning: Do not use if you have a pacemaker or other internal, or implanted medical device. Not intended for use by children under 13. Always consult your physician. Slippery when wet
- We recommend charging your device every few days to ensure you are always tracking. Charge time: One to two hours. Battery life: up to 7 - 10 days. Battery type: Lithium-polymer
- Syncs with Windows Vista and later, Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, and leading Android and Windows devices
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.0 ★★★★★
Based on 1844 reviews
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Product Reviews
★★★★★ 1
BE AWARE AND NEVER BUY THIS LAPTOP!
Capacity: 16gb | 416gb Storage, Color: Silver
I purchased this laptop in January, and by March, it was already showing major issues. The performance declined rapidly — it became unbearably slow, frequently crashed, and often struggled to open even basic programs or web pages. Using it has been incredibly frustrating.
Unfortunately, I didn’t dig deep enough into reviews before buying and was misled by overly positive ones. After running into these problems, I did more research and discovered that this model is widely known for poor performance and reliability.
I called HP and they told me that Amazon or 3rd party sellers modify the laptop from the original 4 GB RAM to 16 GB. This laptop is not compatible with 16 GB, and that's why this is a piece of garbage.
HP also informed me that there are many customers who are experiencing the same problem, but because the laptop was modified by a third party, they can’t honor the warranty or provide technical support for the device in its current configuration.
I strongly recommend avoiding this laptop. Take the time to research alternatives (and maybe invest a bit more) to get something reliable. This one simply isn’t worth the frustration.
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Reviewed in the United States on July 3, 2025
★★★★★ 5
HP Laptop purchase
Capacity: 4GB | 1.12TB Storage, Color: Gold
This laptop work really great. No glitches.
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Reviewed in the United States on May 29, 2026
★★★★★ 5
Wrong order on my part
Capacity: 4GB | 1.12TB Storage, Color: Gold
It’s good but I ordered the wrong kind
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Reviewed in the United States on June 12, 2026
★★★★★ 5
A Genuine Game-Changer for Manufacturing Management
Color: Matte Black, Clear Lenses, Size: Standard
A Genuine Game-Changer for Manufacturing Management
These glasses have been nothing short of life-altering for my career. As a production manager overseeing a manufacturing facility, documenting Standard Operating Procedures (SOPs) has always been a significant hurdle. My primary goal in purchasing these was to record high-quality POV video of processes, which I can then feed into AI tools to generate written SOPs. This isn’t just a win for my productivity; it’s a win for my crew, as it finally provides them with the clear documentation they need to succeed, relieving me of the stress that comes with inconsistent training materials.
**Design & Comfort**
I initially opted for the larger frame, but the height was a bit much aesthetically for my face. The standard size, however, is excellent. I have a history of headaches from standard eyewear after long days, but these remain comfortable for extended wear. They are impressively discreet—I had multiple people compliment them on day one without ever realizing they were smart glasses. They are convincing enough to pass as normal eyewear to the untrained eye.
**Performance & Battery**
* **Video & Audio:** The video quality is surprisingly clear, and the microphone performance is exceptional. I’ve taken several calls while wearing them, and the recipients couldn’t tell the difference between these and my phone’s handset. The audio is solid—provided you keep your expectations realistic regarding the low end. The bass is sufficient for daily listening.
* **Battery:** This is the one area that requires adjustment. You’ll get about 30+ minutes of continuous recording, which drains the battery quickly. However, the charging speed via the included case is remarkably fast, which helps mitigate the downtime.
**The "Unexpected" Features**
While I bought these for SOP documentation, the note-taking and translator features have been revelations. On the production floor, I’m constantly pulled in four different directions. When I need to track material requests or quick process changes on the fly, these allow me to capture information immediately so nothing slips through the cracks. It has turned a single-use tool into an all-day essential.
**Verdict**
I am currently investigating sourcing safety-rated lenses to integrate these into my daily shop-floor workflow. While the frames themselves aren't officially safety-rated, for office-based procedures and light floor work, they have already become a staple of my daily routine. Between the hands-free note-taking, clear communication, and the efficiency they bring to training, these are an incredible value for anyone in a management or technical role.
**Pros:**
* Excellent microphone and video clarity.
* Inconspicuous, stylish design.
* Invaluable for hands-free documentation and note-taking.
* Fast-charging case.
**Cons:**
* Battery life is limited during heavy recording sessions.
* Frame is not officially rated for high-impact industrial safety environments.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Best product on Sale all year!!! Worth every penny!!!
Color: Matte Black, Transitions Grey Lenses, Size: Standard
I was so super excited to get my glasses. They are super easy to set up and come in awesome RanBan case!!😍 I am a photographer and I bought to record my shoots of my clients are comfortable with it and the video quality is amazing!!! I also have a Mother in Law coming and for the first time I will be able to communicate with her with its translation ability!!!! 10 out 10 product!
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Reviewed in the United States on May 20, 2026