Fitness rings · Model guide · Maker specs
COLMI R02
Get the COLMI R02 if you wear a US size from 7 to 13 and want sleep, heart-rate and SpO2 tracking for $55.98 with no subscription.
Product images
COLMI R02, from its Amazon listing.
Credit: Amazon.com (Associates Program). Amazon listing
Product image from the Amazon listing.
In short
Get the COLMI R02 if you wear a US size from 7 to 13 and want sleep, heart-rate and SpO2 tracking for $55.98 with no subscription. It's a stainless steel ring of about 3.6 grams at size 7, rated 5 ATM, with about 5 days of battery. COLMI's newer Ring 2 costs $79.98.
Who it is for
- Budget buyers in US sizes 7–13 who want sleep, heart rate, HRV and SpO2 records without a monthly fee.
- Owners of an R02 or a COLMI Ring 1 who want the official specs in one place.
- People with older phones. QRing supports Android 5.1 and iOS 9.0 and later.
Who should skip it
- Anyone who wants COLMI's current ring. That's Ring 2, which cost $79.98 on 19 September 2026.
- Anyone who needs exact dimensions before buying. COLMI gives R02's weight but not its width or thickness.
- Anyone after medical-grade tracking. COLMI describes R02's records as wellness information.
What sets it apart
- $55.98 at COLMI's store, against $79.98 for Ring 2 on the same day.
- No required monthly subscription for the core records in COLMI's QRing app.
- A published 5 ATM rating and battery capacity (15 mAh, or 18 mAh from size 10 up), which COLMI doesn't list for Ring 2.
- About 5 days of typical use and up to 15 days on standby, with about 1.5 hours to recharge.
Caveats
- COLMI's colors don't agree. Its spec lists gunmetal, rose gold and silver, but the store's color picker showed gold, rose gold, silver and black, so go by what the store lets you select.
- COLMI's spec says R02 charges on a magnetic cable, but its box list includes a charging case as well as a cable.
- Spec tables on colmi.info and colmi.store aren't COLMI's official R02 listing at colmi.com.
Key specs
In the same order on every ring page, so you can compare models.
| Spec | Value | Source and notes |
|---|---|---|
| Materials | Stainless steel | COLMI R02 product details |
| Width | Not given for R02. COLMI says Ring 2 is 12.5% narrower, without an R02 measurement to compare | COLMI R02 and Ring 2 pages |
| Thickness | Not given by COLMI. A 2.7 mm figure on a reseller site isn't COLMI's number for R02 | COLMI R02 page |
| Weight | About 3.6 g at size 7 | COLMI R02 product details |
| Sizes | US ring sizes 7–13 | COLMI R02 product details |
| Finishes | Spec: gunmetal, rose gold, silver. The store's color picker showed gold, rose gold, silver and black | COLMI R02 product details; color picker (19 September 2026) |
| Battery | About 5 days of typical use; up to 15 days on standby. Capacity: 15 mAh, or 18 mAh for size 10 and up | COLMI R02 product details |
| Charging | About 1.5 hours, on a magnetic charging cable | COLMI R02 product details |
| Charging case | The box list shows COLMI Ring 1, a charging case, a charging cable and a quick start guide; the spec names only the magnetic cable | COLMI R02 page, “Included in the Box”; product details |
| Water resistance | 5 ATM for everyday water resistance. Avoid hot water, saunas and high-pressure water | COLMI R02 product details |
| Sensors | COLMI lists the records rather than the sensors: sleep, heart rate, HRV, SpO2, stress and temperature trends | COLMI R02 product details |
| Sleep tracking | Sleep duration, sleep trends and nightly rest patterns in QRing | COLMI R02 product details |
| Activity / fitness | Steps, distance, calories; multi-sport mode; remote camera shutter and find-my-ring. Not a GPS sports watch | COLMI R02 product details |
| App | QRing | COLMI R02 product details |
| Subscription / data access | No required monthly subscription fee for the core QRing records | COLMI R02 FAQ |
| Phone platforms | Android 5.1 or later; iOS 9.0 or later | COLMI R02 product details |
| Wireless | Bluetooth 5.2 Low Energy | COLMI R02 product details |
| US price | $55.98 on colmi.com, 19 September 2026 | COLMI R02 page |
| Price band | Budget, no subscription | COLMI R02 page |
| Announced | Ring 1 family; COLMI gives no date | COLMI R02 page |
| Availability | On sale at colmi.com for $55.98 on 19 September 2026; COLMI's current family is Ring 2 | COLMI R02 and Ring 2 pages |
COLMI R02 extras
Specs only this model has.
| Spec | Value | Source and notes |
|---|---|---|
| R02 or Ring 1? | One ring, two names: the product details call it the COLMI R02 Smart Ring, while the vendor line and FAQ call it COLMI Ring 1 | COLMI R02 page (19 September 2026) |
| Versus COLMI Ring 2 | Ring 2 is COLMI's current family, listed at 7 mm and $79.98. R09 is another Ring 1-family model | COLMI Ring 2 and R09 pages |
| COLMI R10 | Sold at colmi.com for $65.98 on 19 September 2026, with the same specs as R02: 15 mAh (18 mAh from size 10), about 3.6 g at size 7, sizes 7–13 | COLMI R10 page (19 September 2026) |
R02, Ring 1 and Ring 2
R02 is the older model in COLMI’s Ring 1 family, and COLMI still sells it. Its page uses both names: the model line says R02, the vendor line and FAQ say Ring 1. COLMI’s current ring is Ring 2, and here’s how the two compare on what COLMI publishes.
| Spec | COLMI R02 | COLMI Ring 2 |
|---|---|---|
| Price, 19 September 2026 | $55.98 | $79.98 |
| Family | Ring 1, older | Current |
| Dimensions | Not published | 7 mm; COLMI says 12.5% narrower |
| Water rating | 5 ATM | Not published |
| Battery capacity | 15 mAh; 18 mAh from size 10 | Not published |
If water resistance matters to you, R02 is the one with a rating: 5 ATM for everyday water, though COLMI says to keep it away from hot water, saunas and high-pressure water. If you want COLMI’s current design, Ring 2 is it. COLMI also lists R09, another Ring 1-family model.
Battery and charging
COLMI rates R02 for about 5 days of typical use and up to 15 days on standby. Bigger rings get a bigger battery: 15 mAh in the smaller sizes, 18 mAh from size 10 up. A full charge takes about 1.5 hours.
What it tracks
R02 records sleep, heart rate, HRV, SpO2, stress and temperature trends, and counts steps, distance and calories, with a multi-sport mode for workouts. It can also act as a remote camera shutter for your phone, and the app can help you find the ring. It isn’t a GPS sports watch.
Price
R02 cost $55.98 at colmi.com on 19 September 2026. The same day, Ring 2 was $79.98, and the R10, which has the same specs as R02, was $65.98. Check colmi.com for the day’s price before you buy.
Sources
- Amazon product listing — accessed 2026-09-20
- COLMI — R02 smart ring — accessed 2026-09-19
- COLMI — Ring 2 — accessed 2026-09-19
Frequently asked questions
Is the COLMI R02 the same as COLMI Ring 1?
Yes, as far as COLMI's own store goes. The R02 page names the model COLMI R02 Smart Ring, while its vendor line, FAQ and box list call it COLMI Ring 1.
How wide and thick is the R02?
COLMI doesn't say. It gives the weight, about 3.6 grams at size 7, but no width or thickness. A 2.7mm thickness on a reseller site isn't COLMI's figure, and COLMI's claim that Ring 2 is 12.5% narrower doesn't give you an R02 measurement.
Does the R02 need a subscription?
No. COLMI says there's no required monthly fee for the core records in its QRing app.
Is the R02 different from the COLMI R10?
Only in price, going by COLMI's specs. R10 sold for $65.98 on 19 September 2026, against $55.98 for R02, with the same battery (15 mAh, or 18 mAh from size 10), weight (about 3.6 grams at size 7) and sizes 7–13.
Does the R02 work with an iPhone?
Yes. QRing runs on iOS 9.0 or later and on Android 5.1 or later, and the ring connects over Bluetooth 5.2.
Can I use the R02 for birth control or fertility tracking?
No. COLMI says its cycle reminders aren't for diagnosis, contraception, fertility prediction or treatment, and the R02 isn't a medical device.
Official product page: COLMI R02. Specs: COLMI R02 specs.