Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
B57 Bluetooth Calling Wrist Smartwatch with Heart Rate Monitor
Product details
General specs
- Model: B57
Starting from €11.41
Last price update: 9/22/26
Similar products comparison
| This model | Recommendations | |||||
|---|---|---|---|---|---|---|
Bluetooth Calling Wrist Smartwatch with Heart Rate Monitor Bluetooth calling
|
Yinsung W34 Bluetooth calling
|
Yinsung W4 Heart rate monitor
|
ECG and Heart Rate Monitoring Smartwatch with Bluetooth Calling ECG monitoring
|
Bluetooth ECG Heart Rate Monitor Smart Watch ECG monitoring
|
IWO W34 Bluetooth calling
|
|
| 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 | |||
