Don't buy it! The size guide is completely wrong: I ordered according to the seller's exact measurements (70 mm / Size 13) and the ring arrived gigantic and unusable. To top it off, the seller does not accept returns or refunds. Totally disappointed, don't waste your money.

Very good

Very easy app to install and all the health data is very useful for tracking sports activities sleep et cetera really love it. the ring itself is comfortable to wear and a lot easier than wearing my apple watch.

I had to exchange it, it was too big, so I bought a size smaller than the measurement I took with a regular tape measure (2 sizes smaller will be too small). The ring is good, delivery was fast, but since my hand is small and the ring is curved, it was a bit uncomfortable; the silicone cover helps. It didn't measure sleep accurately, but the rest is going well, I'm liking it.

Pretty cool little ring. I'll test the battery to see if it's good.

It came in perfect condition, easy to use and set up. I use it to track physical activities and the battery lasts about a week. Very comfortable and has been very useful! Highly recommend!

I have been using it for a few days and it's wonderful. Occasionally a green or red light comes on, performing the measurements I authorized. It's very good, well worth the money.

I will test it in everyday use, but initially it came very well packaged and comes with a manual and accessories.
One observation is that I should have chosen a smaller size, because even after measuring beforehand, I found that the ring is loose on my finger.

Great value. it uses about 20% battery a day with my preferred settings.

Great ring, very good value for money, I recommend it!

The ring is very nice, but the size is not right. I ordered size 9 for my 60 mm finger, and this ring turned out to be too big. So order a few sizes smaller. I will order size 7, because I think it will fit perfectly; size 8 will also be too big.

2024 COLMI R09 Smart Ring Men Women with Charging Case, Body Temperature Health and Sleep Monitor For Xiaomi Samsung Phone

I really liked it; it delivers what it promises.

It fit well!

Everything is great, I also compared two rings, the Colmi cuts very well.

I have been using the smart ring for just under a week and so far it has been a very positive experience. The battery lasted 4 days.

It arrived well before the deadline.

As described in the advertisement, I think the size I chose, or rather the measurement that was given to me, is somewhat just right. Well, it's size 13 and there's no larger size, so... it comes with a charging case, two cables (one USB for the case and another magnetic in case we want to charge it directly without using the case. You can use your own charger. It also comes with a transparent silicone protector (to protect it from scratches when needed). Very good, I hope the data provided is reliable.

It fit perfectly! The app is super intuitive and the delivery was super fast to the south of Brazil. It's very beautiful, there was a comment from a girl with the measurements and her comment helped me a lot! It fit perfectly on the finger I wanted to use! 10/10

1 week of use and I'm loving it! The size is small! I wear size 17 in Brazil and it fits quite snugly. The gold color is discreet, identical to the color and material of my gold Apple Watch! It's waterproof, I wash my hands normally with it on! Highly recommended!