Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
Simplefun B57 Smart Bracelet with Heart Rate and Sleep Monitoring
The B57 is a smart bracelet and fitness tracker with heart rate monitoring, sleep monitoring, and sports and health tracking.
These features bring activity, heart rate, and sleep monitoring together in one wearable device.
Features
- Sleep monitoring
- Sports and health tracking
- Heart rate monitoring
General specs
- Brand: Simplefun
- Model: B57
- Seller: Alibaba
- ID: 62315448745
- Use: Sports
- Brand: Simplefun
- Model: B57
- Product Type: Smart Bracelet, Health Watch, Fitness Tracker
- Monitoring Features: Heart Rate, Sleep Monitor
- First listed by seller: September 22, 2026
If you are interested in more details, you can find full information on the seller's page.
€12.73
Last price update: 9/22/26
Available to order
Shipping options
Delivery to 
United States
United States
Available
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| Brand | Simplefun | Fancytech | Amazon | |||
| Model | B57 | F8 | Q8S | T80 | T4 | T89 |
| Color | ||||||
| Rating | ||||||
| Price | €12.73 | €12.16 | €16.40 | €10.45 | €13.17 | €29.69 |
| Seller | Alibaba | Alibaba | Alibaba | Alibaba | Alibaba | Alibaba |
| Update | Sep 27, 2026 | Sep 27, 2026 | Sep 27, 2026 | Sep 27, 2026 | Sep 27, 2026 | Sep 27, 2026 |
| Product Type | Smart Bracelet, Health Watch, Fitness Tracker | Smart Bracelet | Smart Bracelet, smartwatch, fitness tracker, smart watch | smart watch, Fitness Tracker, smart bracelet, smartwatch | Smart Watch | |
| Heart Rate Monitoring | Heart Rate Monitor | Heart Rate Monitor | Heart Rate Monitor | |||
| Blood Pressure Monitoring | Blood Pressure | Blood Pressure Monitor | blood pressure | |||
Simplefun B57 Heart rate monitoring
€12.73
When this device makes sense
Product confidence
Reviews
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