R02 Smart Ring, a Smart Ring for Women and Men, with a Charging case, Supports Heart Rate, Blood Oxygen, Sleep Health Monitoring, and Sports Tracking Ring. (Silver, 10#)
$6.99
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Price: $6.99
(as of Nov 17, 2025 04:15:11 UTC – Details)
Product description
[Purchase a Sizing Kit] Before purchasing the COLMI Smart Ring R02, we recommend that you purchase the COLMI Sizing Kit to help you choose the right ring size.
[Heart Rate Measurement] 24/7 smart heart rate measurement allows you to understand your heart rate status and monitor heart rate abnormalities, keeping track of your daily health.
[Sleep Measurement] Detects falling asleep and waking up, monitors sleep quality and duration, and generates concise reports to help you understand your sleep patterns and adjust your habits for a more restful rest.
[Portable Charging Case] Includes a compact charging case for charging anytime, anywhere, without worrying about running out of power.
[Activity Tracking] Easily track steps, distance, and calories burned to motivate you to stay active every day.
[Photo Control] Remote camera control allows you to control your phone’s camera with a flick of a finger, making selfies, group photos, and creative photography more convenient.
[Best After-Sales Service] Thank you for your trust and we provide professional after-sales service. If you have any usage or quality issues, please feel free to contact us. Included accessories: 1 smart ring, 1 portable charging case, 1 charging cable, and 1 instruction manual.
9 reviews for R02 Smart Ring, a Smart Ring for Women and Men, with a Charging case, Supports Heart Rate, Blood Oxygen, Sleep Health Monitoring, and Sports Tracking Ring. (Silver, 10#)
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$6.99
chris snyder –
What an amazing ring!
Amazing ring! It has tracked my every step, my sleep, and my heart rate and o2. It’s so good for the price!The battery lasts for at least a couple days I haven’t tested past that yet! It’s great! I got a size 9 and can wear it on my index or middle finger.
Julie Smith –
Simply AMAZING
AMAZING RING! The ring is so lightweight but still durable. The app is easy to navigate and I love that it syncs with the Apple health app. I also enjoy that it tracks overtime and puts it into a graph that is easy to read. I got the size 9 and can easily fit it on my index and middle finger.
Arelys –
Great Smart Ring for the Price
I’ve been using the COLMI R02 Smart Ring for a few days now and I’m genuinely impressed, especially considering its price point. It’s lightweight, comfortable, and tracks my heart rate, sleep, and steps surprisingly accurately. The battery lasts several days on a single charge, and I love that it’s waterproof so I don’t have to take it off all the time. If you want a stylish and affordable way to track your fitness, this is a great buy!
Alex and V –
There must be a better device.
I wanted to like this ring. I bought the size that would fit over my right hand knuckle(right hand dominant) so that was a good fit. The fully charged battery lasted maybe 36 hours. That didn’t bother me. BUT reading my pulse at 99 while sitting reasonable still for an hour caused me to check my pulse elsewhere. It was 70 bpm by taking pulse and using my phone app.It did best at sleep tracking but I was paying more attention to the data while awake so that accuracy wasn’t what I needed most. I know what time I go to bed and when I waken. I had no issues connecting to the phone .I’ll keep trying.
Kaitlin Simoneaux –
High end quality without the high end price tag!
Received this smart ring a few days ago and I am obsessed! I love how it tracks my health stats just like the big name brand smart rings, but for a fraction of the price! It is sleek and looks very high end. I ordered a size 7 and it’s true to size and fits perfectly! 10/10!!
TLove –
Worst ring ever
This is the worst smart ring I ever purchased. It doesn’t have battery life so you don’t know when to charge it. The calories and steps walk is incorrect. I’m not sure about the sleep cycle since else is wrong. I will be returning and pray I can get my money back!
Nathan –
Great value ring!
This ring seems great. It is a little tight but I think it’s supposed to be. It’s very weightless. I like that is is waterproof. The price of it is way better than aura ring, will post an update soon!
Andrea de la Torre –
Smart ring
So far I have been using it for a few weeks. I like a lot of the features and the battery last a long time. The only thing that I don’t like is that , it doesn’t track my naps. I took a very long nap while wearing the ring and it didn’t track it. The app is so easy to use and the ring has been comfy. I sized upTemperature tracking would be a good plus!I think it’s worth it if you don’t have a smart watch and if you want to keep track of your steps/ sleep.Waterproof ✅Comfortable ✅Battery life ✅
Amazon Customer –
The sizing was wrong and it takes forever to get to you even with prime and takes forever to get your refund