Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
KarenM B57C B57C 2019 Smartwatch with Heart Rate Monitor and Music Control
Features
- Big screen
- Heart rate monitor
- Music control
General specs
- Brand: KarenM
- Model: B57C
- Seller: Alibaba
- ID: 62136038980
- Brand: KarenM
- Model: B57C
- Music Control: Music control
- Display Feature: Big screen
- 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.
€10.71
Last price update: 9/22/26
Available to order
Shipping options
Delivery to 
United States
United States
Available
The KarenM B57C is a smartwatch from 2019 with a big screen. It includes a heart rate monitor and music control.
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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 | ||
KarenM B57C Big screen
€10.71
When this device makes sense
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