Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
allentian C21 Heart rate, blood pressure and blood oxygen monitoring Medium Smartwatch
Available offers (2)
Current
Heart rate, blood pressure and blood oxygen monitoring
Newegg
€110.86
Available to order
Features
- Bluetooth calling
- Multi-sport modes
- Heart rate, blood pressure and blood oxygen monitoring
- Compatible with Android and iOS
General specs
- Brand: allentian
- Model: C21
- Seller: Newegg
- ID: 9SIAEWSKAK4607
- Size: Medium
- Brand: allentian
- Calling: Bluetooth calling
- Model Name: C21
- Monitoring: Heart rate, blood pressure and blood oxygen monitoring
- Part Number: 676959425408AllBlack
- Product Type: Smartwatch
- Sports Modes: Multi-sport
- Compatibility: Android and iOS
- First listed by seller: November 7, 2026
If you are interested in more details, you can find full information on the seller's page.
€110.86
Last price update: 11/7/26
Available to order
Shipping options
Delivery to 
United States
United States
Available
Smartwatch with Bluetooth calling, multi-sport modes, heart rate, blood pressure and blood oxygen monitoring, and compatibility with Android and iOS.
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| Brand | allentian | allentian | allentian | allentian | allentian | allentian |
| Model | C21 | C20plus | C20plus | C21pro | Gw55 | K28h |
| Price | €110.86 | €62.19 | €88.33 | €69.40 | €70.30 | €158.63 |
| Seller | Newegg | Newegg | Newegg | Newegg | Newegg | Newegg |
| Update | Nov 12, 2026 | Nov 12, 2026 | Nov 12, 2026 | Nov 12, 2026 | Nov 12, 2026 | Nov 12, 2026 |
| Size | Medium | Medium | Medium | Medium | Medium | Medium |
| Calling | Bluetooth calling | Bluetooth calling | Bluetooth calling | |||
| Model Name | C21 | C20plus | C20plus | C21pro | Gw55 | K28h |
| Part Number | 676959425408AllBlack | 779921415051Green | 779261361669Green | 719091237520Black | 738232095143AllBlack | 658630977581AllBlack |
| Product Type | Smartwatch | Smartwatch | Smartwatch | Smart watch | Smart watch | Smartwatch |
| Compatibility | Android and iOS | Android and iOS | Android and iOS | Android and iOS | Android / iOS | Android and iOS |
allentian C21 Bluetooth calling
€110.86
When this device makes sense
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