Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
Simplefun B57 B57 Smart Bracelet with Heart Rate and Sleep Monitoring
Features
- Heart rate monitoring
- Sleep monitoring
- Sports and health tracking
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.
€12.94
Last price update: 9/22/26
Available to order
Shipping options
Delivery to 
United States
United States
Available
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.
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| Brand | Simplefun | Fancytech | Amazon | |||
| Model | B57 | F8 | Q8S | 116Plus D13 | ||
| Price | €12.94 | €12.36 | €16.67 | €10.62 | €8.93 | €13.39 |
| Seller | Alibaba | Alibaba | Alibaba | Alibaba | Alibaba | Alibaba |
| Update | Oct 11, 2026 | Oct 11, 2026 | Oct 11, 2026 | Oct 11, 2026 | Oct 11, 2026 | Oct 11, 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 | Smartwatch | Smart Watch |
| Blood Pressure Monitoring | Blood Pressure | Blood Pressure Monitor | blood pressure | |||
Simplefun B57 Heart rate monitoring
€12.94
When this device makes sense
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