Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
CK20S Round-Screen Fitness Smartwatch
Product details
General specs
- Model: CK20S
Starting from €15.69
Last price update: 9/22/26
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| Brand | SANDA | BRIM | BRIM | |||
| Model | CK20S | SANDA CF18 | TD28 | V11 | Karen M V11 | K9 |
| Price | €15.69 | €18.43 | €11.87 | €15.98 | €15.53 | €11.16 |
| 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 | Fitness Watch, Smartwatch, Smart Wrist Watches | Smart Watch | Smart watch, Fitness tracker | |||
| Waterproof Rating | IP67 | IP67 | IP67 | IP67 | IP68 | |
| Heart Rate Monitoring | Heart Rate Monitoring | Heart rate monitor | heart rate | |||
