⚙️ Key Features
Design & Material: Slim and lightweight stainless steel outer shell with a smooth inner resin coating. Weighs approximately 4.4 grams and is just 2.7 mm thick.
Sensors:
Continuous heart rate monitoring
Blood oxygen (SpO₂)
Sleep tracking (including light, deep, and REM stages)
Step count, calories, distance
Stress monitoring
Battery: 17 mAh battery; lasts 3 to 7 days depending on usage. Charges magnetically.
Compatibility: Connects via Bluetooth 5.0 to the QRing app (compatible with Android 5.1+ and iOS 8+).
Waterproofing: Rated IP68 and 5 ATM – safe for showering and shallow swimming.
✅ Pros
Very affordable alternative to premium smart rings
Comfortable enough for 24/7 wear
Tracks all the core health metrics well for most users
Sleek, minimalist design
⚠️ Cons
Sleep tracking can be inaccurate, especially with REM detection
The app lacks deep insights and doesn’t sync with Google Fit or Apple Health
May scratch easily with daily use
No NFC or smart notifications
User Feedback (Summary)
Battery generally lasts 3–4 days under regular use
Users appreciate the price-to-functionality ratio
Accuracy for steps and heart rate is acceptable for casual fitness tracking
Sleep data may show overly optimistic results
Some concerns about build durability over time
Final Verdict
The COLMI R02 is a strong entry-level smart ring. It’s ideal for users who want a sleek, affordable way to track basic health metrics without committing to a more expensive ecosystem. Great for casual users—not recommended if you need precise medical-grade data or robust app integrations.
Max O. –
I’ve been wearing this smart ring for a while now, and the sleep tracking feature is a game changer. It helps me monitor my sleep stages and improve my overall rest quality. The lightweight design is a bonus.
Gavin M. –
The COLMI R02 Smart Ring is astounding for tracking heart rate during workouts. It makes my exercise routine more effective and ensures I stay in the right zone for burning those calories. Additionally, the sleek design is a huge plus as it doesn’t feel bulky while wearing it. Worth the invest, trust me.
Ellie Rose –
I recently tried the COLMI R02 Smart Ring, and I must say, it’s been quite helpful. The best feature for me was the fitness tracker. It motivated me to move more each day, and now I’m more active than ever. The sleep tracker is also a game changer; it helped me improve my sleep quality. The design is sleek and comfortable to wear all day. The only downside is the battery life could be longer. Overall, it’s a solid product, and I’d recommend it to anyone looking to improve their health habits.
Steven Carter –
this smart ring is absolutely amazing. it’s super lightweight and comfortable to wear all day. the battery life is impressive, lasting me a whole week without needing a charge. i can track my heart rate, sleep patterns, stress levels, and more it’s like having a personal health assistant on my finger. the waterproof feature is handy too; i never have to worry about taking it off. for the price, you can’t beat the value this ring offers. 5 stars from me.
Leanne Thompson –
The COLMI R02 Smart Ring is a handy gadget that’s stylish and functional. I was impressed by how quickly it arrived, and the packaging was secure. The ring’s features are easy to use, and it adds a tech savvy touch to my outfits. Great purchase overall.
Leanne Thompson –
The COLMI R02 Smart Ring is a handy gadget that’s stylish and functional. I was impressed by how quickly it arrived, and the packaging was secure. The ring’s features are easy to use, and it adds a tech savvy touch to my outfits. Great purchase overall.
Alice M. –
I’ve been using the COLMI R02 Smart Ring for a while now, and I’m impressed. The battery life is fantastic, lasting up to 7 days depending on how much you use it. The sleep tracking feature is spot on it even breaks down my sleep stages. And when I had a question about syncing it with my phone, the customer support team was quick to respond and super helpful. Overall, it’s a reliable and stylish smart ring that I highly recommend for anyone looking to track their health and fitness effortlessly. 5 stars from me.
Emily J. (verified owner) –
The COLMI R02 Smart Ring surprised me with its elegance and functionality. Despite a minor setting hiccup, it synced seamlessly with my devices. The speedy delivery and exceptional packaging thrilled me. A worthy purchase.
Owen Patel (verified owner) –
The COLMI R02 Smart Ring is a sleek tech accessory that packs a punch. With features like continuous heart rate monitoring, sleep tracking, and stress monitoring, this little gadget is a powerhouse. The 17 mAh battery lasts longer than most smartwatches, and the waterproof rating is a game changer for me. The QRing app is easy to use, although I had a bit of a hiccup setting it up, customer support was quick to assist. Overall, a solid choice for anyone looking to track their health without breaking the bank. 4 out of 5 stars.
Dave Johnson (verified owner) –
The COLMI R02 Smart Ring is my go to for tracking my daily steps and stress levels. The sleek stainless steel design makes it comfortable to wear all day long. The battery life is impressive, lasting me up to a week on a single charge. 5 out of 5.
Paul H. (verified owner) –
hey, just got this smart ring and i gotta say, it’s pretty cool. it’s so light on my finger, i barely notice it’s there. it tracks my heart rate, sleep, steps, and even my stress levels super helpful. battery life is decent, lasts a few days. it’s waterproof too, so i can wear it in the shower. overall, happy with my purchase, 4 out of 5 stars.