R02
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R02 — The “keep it simple” ring
Best Seller
Tracks your sleep, steps, and heart rate in a design you’ll actually want to wear. No subscription. Ever.
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Details & specs
Highlights
- Best value starter
- Lightweight, minimal look
- Great for trying a smart ring
Quick specs
Battery5–7 days per charge
Temperature trackingYes
Touch controlNo
DisplayNo
NFCNo
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30-Day Free Returns
No subscription fees
2026-03-21
Super awesome company to work with love my ring!
2026-03-18
so amazing and works great
2026-03-17
Look good but I ordered the wrong size seems to run small. Pics included
2026-03-17
No content.
2026-03-16
Performance: Amazing! Quality of work: Waterproof works amazing
2026-03-16
No content.
Compare models
You’re viewing R02. Swipe on mobile.
| Features |
R05+
Best for: NFC + notifications
|
R11
Best for: display + touch control
|
R09+
Best for: temperature monitoring
|
Charging Case
Best for: charging on the go
|
||
|---|---|---|---|---|---|---|
| Body temperature | ||||||
| Touch control | ||||||
| Display screen | ||||||
| Health & fitness metrics | Included | Included | Included | Included | Included | |
| NFC | ||||||
| Includes charging case | Standalone |
Sizing Guide
Make sure you choose the right size (fast reference).
Measure an existing ring
Measure the inside diameter of a ring that fits the finger you’ll wear the smart ring on.
| Size | Inner Diameter (mm) | Circumference (mm) |
|---|---|---|
| 7 | - | - |
| 8 | 18.3 | 57.5 |
| 9 | 19.1 | 60.0 |
| 10 | 20.0 | 62.8 |
| 11 | 20.8 | 65.4 |
| 12 | 21.6 | 67.9 |
| 13 | 22.3 | 70.0 |
Quick tips
- If you’re between sizes, size up for comfort.
- For best sensor contact, a snug (not tight) fit works best.
- Your fingers can swell—check sizing later in the day.