Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
KarenM B57C 2019 Smartwatch with Heart Rate Monitor and Music Control
Product details
General specs
- Brand: KarenM
- Model: B57C
Starting from €10.71
Last price update: 9/22/26
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| Model | B57C | GT105 | T5 | Y3 Plus | ||
| Price | €10.71 | €10.62 | €13.38 | €13.20 | €10.26 | €14.28 |
| 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 | Heart Rate Monitor | ||
| Product Type | Smart Watch | Smartwatch | Smart Watch, Smartwatch | Smart Watch | ||
