Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
allentian T21 Configuration unspecified Medium Smartwatch
Features
- Measures heart rate and blood pressure.
- Supports Bluetooth calling.
- Waterproof; rating not specified.
- Compatible with Android and iOS.
General specs
- Brand: allentian
- Model: T21
- Seller: Newegg
- ID: 9SIAEWSKAT8184
- Size: Medium
- Brand: allentian
- Calling: Bluetooth calling
- Model Name: T21
- Part Number: 5157592253254
- Product Type: Smartwatch
- Compatibility: Android and iOS
- Water Resistance: Waterproof; rating not specified
- Health measurements: Heart rate and blood pressure
- First listed by seller: November 5, 2026
If you are interested in more details, you can find full information on the seller's page.
€59.49
Last price update: 11/5/26
Available to order
Shipping options
Delivery to 
United States
United States
Available
Medium smartwatch with heart rate and blood pressure measurements, Bluetooth calling, and Android and iOS compatibility. It is described as waterproof, but no rating is specified.
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allentian T21 Measures heart rate and blood pressure.
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allentian C21 Bluetooth calling
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| Brand | allentian | allentian | allentian | allentian | allentian | allentian |
| Model | T21 | C21 | K59 | C20 | Ht17 | C20plus |
| Price | €59.49 | €110.86 | €77.51 | €57.68 | €56.78 | €88.33 |
| 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 | Supported | Bluetooth calling | Bluetooth calling | |
| Model Name | T21 | C21 | K59 | C20 | Ht17 | C20plus |
| Part Number | 5157592253254 | 676959425408AllBlack | 5237387484993 | 5100578589451 | 5412767306073 | 779261361669Green |
| Product Type | Smartwatch | Smartwatch | Smartwatch | Smartwatch | Smart watch | Smartwatch |
| Compatibility | Android and iOS | Android and iOS | Android and iOS | Android and iOS | Android / IOS | Android and iOS |
allentian T21 Measures heart rate and blood pressure.
€59.49
When this device makes sense
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