Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
B57 Fitness Sports Watch
Product details
General specs
- Model: B57
Starting from €10.62
Last price update: 9/22/26
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| Model | B57 | B57 | Y7 | KW10 Smart Watch 2019 | SKY2 | CF68 |
| Price | €10.62 | €10.26 | €13.21 | €22.04 | €18.30 | €17.67 |
| 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 |
| Heart Rate Monitoring | Heart Rate Monitor | Heart Rate Monitor | Heart Rate Monitor | |||
| Ingress Protection Rating | Ip67 | IP67 | IP67 | |||
| Compatible Operating Systems | Ios, Android | Android, IOS | Android, IOS | Android, IOS | ||
