Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
B57 Fitness Tracker Waterproof Smartwatch with Heart Rate Monitor and Fitness Tracker
Available Options
Current
Fitness Tracker
Alibaba
€10.18
Available to order
Features
- Waterproof
- Heart rate monitor
- Fitness tracker
- Bluetooth connectivity
- Suitable for women and men
Product details
General specs
- Model: B57
- Model: B57
- Water Resistance: Waterproof
If you are interested in more details, you can find full information on the seller's page.
€10.18
Last price update: 9/22/26
Available to order
Shipping options
Delivery to 
United States
United States
Available
Model B57 is a smartwatch with Bluetooth connectivity, a heart rate monitor, and fitness-tracking features. It is listed as waterproof and suitable for women and men.
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| Brand | LEMFO | |||||
| Model | B57 | LEMT | LS01Wifi | F17 | KW19 | |
| Color | ||||||
| Rating | ||||||
| Price | €10.18 | €115.45 | €13.95 | €11.68 | €10.01 | €12.89 |
| Seller | Alibaba | Alibaba | Alibaba | Alibaba | Alibaba | Alibaba |
| Update | Sep 28, 2026 | Sep 28, 2026 | Sep 28, 2026 | Sep 28, 2026 | Sep 28, 2026 | Sep 28, 2026 |
| Product Type | Smart Watch | smart watch | Smart Watch | Smart Watch, Bracelet, Smartwatch, Wristwatch | Smartwatch | smart watch |
| Water Resistance | Waterproof | waterproof | Waterproof | waterproof | ||
Waterproof Smartwatch with Heart Rate Monitor and Fitness Tracker Waterproof
€10.18
When this device makes sense
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