Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
B57 B57 Bluetooth Calling Wrist Smartwatch with Heart Rate Monitor
Features
- Bluetooth calling
- Heart rate monitor
- Compatible with Huawei, Xiaomi, and Samsung devices
General specs
- Model: B57
- Seller: Alibaba
- ID: 62425394878
- Model: B57
- Product Type: smart watch
- Call Function: BT call
- Compatible Brands: huawei, xiaomi, samsung
- Heart Rate Monitoring: Heart Rate 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.
€11.41
Last price update: 9/22/26
Available to order
Shipping options
Delivery to 
United States
United States
Available
The B57 is a Bluetooth calling wrist smartwatch with a heart rate monitor, so it offers calling and heart-rate monitoring from the wrist. It is listed as compatible with Huawei, Xiaomi, and Samsung devices.
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| Brand | Yinsung | Yinsung | IWO | |||
| Model | B57 | W34 | W4 | W34 | W34 Smart Watch | W34 |
| Price | €11.41 | €8.93 | €10.25 | €11.78 | €15.62 | €15.62 |
| 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 watch | smart watch | smart watch, smart bracelet | smart watch, smart bracelet | Smart Watch | Smartwatch |
| Compatible Brands | huawei, xiaomi, samsung | huawei, xiaomi, samsung, apple | huawei, xiaomi, samsung | |||
| Heart Rate Monitoring | Heart Rate Monitor | Heart Rate Monitor | Heart Rate Monitor | |||
Bluetooth Calling Wrist Smartwatch with Heart Rate Monitor Bluetooth calling
€11.41
When this device makes sense
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