Excellent! It tracks time, heart rate, blood pressure, monitors sleep, oxygen level, counts steps, controls the music player, and much more at a super affordable price, and uses an app that doesn't require a subscription. Highly recommended!

Quite satisfied with the purchase, it works according to the product information.

Great look and fit exactly as advertised

Completely satisfied with the purchase. I just didn't know how to measure my finger properly without the ring, but I ended up wearing it on a different finger, not the one I planned to use. Today I would order a smaller size.

Very happy with this little smart ring. i don’t like wearing my apple watch to bed and needed something to record my sleep patterns. this is ideal and such a great price.

The watch is a bit heavy to wear, but since it's a ring, I can wear it without much burden and it's nice to wear. I'm not sure how accurate it is, but I think it's better to have it for self-satisfaction than not having it at all.

Great, for this price I have no complaints - it measures everything perfectly. The only thing I could complain about is that with the display on, the battery lasts quite a short time - about 1-2 days, but without the display it can easily last up to 4 days. It charges in 1:30. I swim a lot in lakes, so the water resistance test was conducted with a positive result.

I bought an identical model that, after 3 months, doesn't last 12 hours on battery life. It seems that it cannot be charged with a turbo charger, as it damages the battery. This new one that arrived is currently lasting three days without needing to be charged. The smart ring is beautiful and highly functional. Let's see if the battery won't cause problems in 2 months like it did with the other one I bought. I filed a complaint but they said they couldn't help me at all. Stay alert. If there is a problem with the battery, file a complaint as soon as possible, otherwise the buyer will bear the loss.

Perfect ring, my husband loved it.

Perfect ring, my husband loved it.

2025 COLMI R12 Smart Ring with Display Screen and Touch, Wireless Charging, Health Manager, 5 ATM Waterproof For Men Women

It took a long time to arrive, but it did arrive. I haven't tried it yet. It's very nice but thinner than I imagined. My ring size is 19 and I got size 9, and it fits perfectly. I'll try it on and test it out.

I recommend it, I really liked the product. Unfortunately, it was too big for my finger, so I recommend always ordering one size smaller to avoid mistakes.

So far, nothing to complain about. I haven't tested all the systems yet so it can have more battery life. But the sleep and heart rate monitor are working almost perfectly.

a tester

Received in perfect condition, however it was loose and does not work accurately. How can I request an exchange?

The ring is beautiful, but unfortunately it came a bit too big. I believe that anyone who buys it should get a size smaller than what they normally wear.

Perfect, I ordered the size with some fear, but it turned out great.

This is the second ring i ordered. 1st one was 7mm diameter and had battery issue - discharged in 2h. this one keeps charge very well. 10 percent was spent in one day. half a day it was doing all the health measurements with their maximal periodicity (heart rate every 5 min).

The colmi r12 smart ring arrived very quickly and was extremely well packed. It is honestly one of the best gadgets i have ever bought.



Before choosing this model, i did a very careful analysis to find a high‑quality chinese smart ring, and the r12 was an excellent surprise. The battery life is great, the tracking accuracy is solid for daily use, and it is very easy to sync with android via the app.



I am very happy with this purchase and definitely recommend this product and seller.