Fitbit FB521GLBM-US Advanced Health and Fitness Smartwatch: All-day stress detection with cEDA
Ever feel like your life's a whirlwind of stress and sleepless nights? The Fitbit Sense 2 might just be your new best friend. It's not just a smartwatch; it's like having a personal health coach strapped to your wrist. With all-day stress detection (thanks to cEDA), a daily Stress Management Score that tells you how chill (or not) you are, and an ECG app to keep tabs on your heart's rhythm, it's got your back. Oh, and it'll nudge you if your heart's doing the cha-cha when it shouldn't be, plus keep an eye on your SpO2 and other health stats.
Sleep like a baby with features that sound like they're from a luxury spa: a Sleep Profile that's all about you, detailed sleep stages, a Sleep Score to brag about, and a smart wake alarm that won't jolt you awake like your old alarm clock. And for those days when you're more couch potato than gym rat, it's got built-in GPS, a workout intensity map (because getting lost is so last year), and a Daily Readiness Score to tell you whether you're ready to conquer the world or just Netflix. With over 40 ways to track your sweat sessions and a design that laughs in the face of water (up to 50 meters, that is), it's ready for anything.
Wear it all day, every day, and never miss a beat—or a call, text, or notification, thanks to Bluetooth connectivity. Customize it to your heart's content with clock faces that match your mood, pay with a flick of your wrist using Fitbit Pay, and ask Alexa for the weather (or to tell you a joke). The battery? It lasts over 6 days, because who has time to charge every night? Plus, snag a 6-month Premium membership for deep dives into your health data. Because knowledge is power, right?
- ECG app for atrial fibrillation assessment
- Personalized Sleep Profile
- Built-in GPS and workout intensity map
- 40+ exercise modes and automatic exercise tracking
- 6+ day battery life
- All-day stress detection with cEDA
General specs
- Brand: Fitbit
- Model: FB521GLBM-US
- Seller: Amazon
- Product Dimensions: 1.57 x 0.47 x 1.57 inches; 1.3 ounces
- Batteries: 1 Lithium Ion batteries required. (included)
- Date First Available: September 23, 2022
- Manufacturer: Fitbit Inc
- Country of Origin: China
- First listed by seller: 5/29/25
If you are interested in more details, you can find full information on the seller's page.
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Comparison with similar products
| This item | Recommendations | |||||
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Fitbit FB521GLBM-US All-day stress detection with cEDA
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Fitbit 6514034 All-day stress detection with cEDA
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Fitbit Sense 2 All-day stress detection with cEDA
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Bluetooth Smartwatch All Day Monitoring Of Heart Rate
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Health Fitness Tracker Smart Watch
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SACOSDING Smart Watch ECG monitoring
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| Brand | Fitbit | Fitbit | Fitbit | Mindrose | SACOSDING | |
| Model | FB521GLBM-US | 6514034 | Sense 2 | Smart Watch | ||
| Color | ||||||
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| Price | $229.99 | $219.00 | $220.00 | $49.99 | $34.19 | $142.89 |
| Seller | Amazon | Amazon | Amazon | Gshopper | Amazon | Joom |
| Update | June 29, 2025 | June 27, 2025 | June 28, 2025 | July 25, 2024 | July 18, 2025 | August 23, 2025 |
| Product Dimensions | 1.57 x 0.47 x 1.57 inches; 1.3 ounces | 1.57 x 0.47 x 1.57 inches; 7.05 ounces | 1.57 x 0.47 x 1.57 inches; 6.74 ounces | |||
| Batteries | 1 Lithium Ion batteries required. (included) | 1 LR44 batteries required. (included) | 1 Lithium Ion batteries required. (included) | |||
| Date First Available | September 23, 2022 | September 23, 2022 | September 23, 2022 | |||
| Manufacturer | Fitbit Inc | Fitbit Inc | Fitbit Inc | |||
| Country of Origin | China | China | China | |||
Advanced Health and Fitness Smartwatch
Jessica R.
Glasgow
June 8, 2025
As a healthcare worker, I was excited to try this out, hoping it would help me manage my busy life. It's been about a month, and while it's great for keeping an eye on my health stats, I'm a bit disappointed that it doesn't always feel accurate. The sleep tracking is nice, but I wish it was simpler to use. Overall, it's a good device, but maybe not worth the hype for everyone. :)
- Pros: I love how it tracks my stress and sleep all day, giving me a score that helps me understand my body better. The battery lasts for ages, which is super convenient, and it feels sturdy even when wet. Getting notifications and being able to pay with it is brilliant.
- Cons: Sometimes it feels a bit overwhelming with all the data, and I could be wrong, but the heart monitoring might not always be spot on. It's a bit pricey for what it does, and the app can be confusing at times.